Fiber optic connector and assembly thereof

ABSTRACT

A factory processed and assembled optical fiber arrangement is configured to pass through tight, tortuous spaces when routed to a demarcation point. A connector housing attaches to the optical fiber arrangement at the demarcation point (or after leaving the tight, tortuous spaces) to form a connectorized end of the optical fiber. A fiber tip is protected before leaving the factory until connection is desired.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a Continuation of U.S. patent application Ser. No.15/780,150, filed on May 30, 2018, which is a National Stage Applicationof PCT/US2016/064223, filed on 30 Nov. 2016, which claims the benefit ofU.S. Patent Application Ser. No. 62/261,107, filed on Nov. 30, 2015, andclaims the benefit of U.S. Patent Application Ser. No. 62/268,331, filedon Dec. 16, 2015, and claims the benefit of U.S. Patent Application Ser.No. 62/412,027, filed on Oct. 24, 2016, the disclosures of which areincorporated herein by reference in their entireties. To the extentappropriate, a claim of priority is made to each of the above disclosedapplications.

BACKGROUND

As fiber deployments continue, more and more interest is being generatedin placing the optical network terminals (ONT) inside the living areasof dwellings (e.g., in proximity to televisions and computers). This isespecially true today in multifamily dwelling units (MDU) applications.

Because of the location and other constraints, pre-terminated assembliesare often threaded and routed through small holes in walls of thedwellings, through small openings in cabinetry, and through small ducts.These applications demands that the pre-terminated parts pass through anarrow, tortuous path before being mated to traditional connectors inthe ONT equipment. However, such mating performed in the field canresult in poorly functioning optical connectors.

Improvements are desired.

SUMMARY

Some aspects of the disclosure are directed to an optical fiberarrangement suitable for passing through tight, tortuous spaces. Otheraspects of the disclosure are directed to a connector housing suitablefor easily attaching to such an optical fiber arrangement. Still otheraspects of the disclosure are directed to methods of cabling a dwelling.

Certain types of fiber optic arrangements can be assembled in a factory.In certain implementations, the fiber optic arrangement includes anoptical fiber having a fiber tip that is coupled to an optical ferrule,prepared, and protected at the factory. For example, the fiber tip canbe tuned and polished at the factory and a dust cap can be mounted tothe optical ferrule to cover and optionally seal the fiber tip.

The fiber optic arrangement is routed to a demarcation point (e.g., anONT, a wall outlet, etc.) when installed in the field. Certain types offiber optic arrangements have sufficiently small form factors to fitthrough narrow, tortuous routing paths (e.g., wall ducts) en route tothe demarcation point. In some examples, the fiber optic arrangement canbe pulled through the routing path. In other examples, the fiber opticarrangement can be blown through the routing path.

At the demarcation point, the fiber optic arrangement is assembled withan optical connector body to form a connectorized end of the opticalfiber. To plug the connectorized end into the ONT, wall outlet, or otherconnection point in the field, the dust cap is removed to provide accessto the fiber tip. In certain examples, the dust cap is not removed untilconnection is desired. Accordingly, the fiber tip is protected betweenprocessing in the factory and connection in the field.

In certain implementations, an optical fiber arrangement has an endterminated in the factory. In certain implementations, the factoryterminated end of the optical fiber arrangement has a form factor ofless than 4 mm. In certain examples, the factory terminated end of theoptical fiber arrangement has a form factor of no more than 3.8 mm. Incertain examples, the factory terminated end of the optical fiberarrangement has a form factor of no more than 3.7 mm. In certainexamples, the factory terminated end of the optical fiber arrangementhas a form factor of no more than 3.6 mm.

In certain implementations, the factory terminated end of the opticalfiber arrangement is configured to mate with an optical connector body.In some examples, the factory terminated end of the optical fiberarrangement is configured to mate with the connector body of an SCconnector. In other examples, the factory terminated end of the opticalfiber arrangement is configured to mate with the connector body of an LCconnector. In some examples, the factory terminated end of the opticalfiber arrangement is configured to mate with the connector body of anLX.5 connector. In some examples, the factory terminated end of theoptical fiber arrangement is configured to mate with the connector bodyof an ST connector.

Some aspects of the disclosure are directed to a method of connecting anoptical fiber of an optical network to a demarcation point in the field.The method includes obtaining a fiber optic arrangement including anoptical fiber including an optical fiber having a polished tip held atan optical ferrule; routing the fiber optic arrangement through a ducthaving a maximum inner diameter of no more than 4 mm; and assembling anoptical connector body around the polished tip of the fiber opticarrangement by sandwiching the optical ferrule between a proximalhousing and a distal housing of the optical connector to form anassembled optical connector. The optical fiber arrangement has a largestouter diameter of no more than 4 mm.

In certain implementations, the optical fiber arrangement has a largestouter diameter of no more than 3.9 mm. In certain implementations, theoptical fiber arrangement has a largest outer diameter of no more than3.8 mm. In certain implementations, the optical fiber arrangement has alargest outer diameter of no more than 3.7 mm. In certainimplementations, the optical fiber arrangement has a largest outerdiameter of no more than 3.6 mm.

In certain implementations, the polished tip is tuned relative to aferrule hub coupled to the optical ferrule.

In certain implementations, the method also includes removing a dust capfrom the optical ferrule of the assembled optical connector; andplugging the assembled optical connector into a connection site.

Some aspects of the disclosure related to a kit for assembling a fiberoptic connector. The kit includes a fiber optic arrangement; a proximalhousing; and a distal housing. The fiber optic arrangement includes anoptical cable having an optical fiber terminated at an optical ferruleassembly including a ferrule hub, the ferrule hub carrying a keyingmember that is rotationally keyed to the hub. The proximal housing has aproximal portion and a distal portion. The distal portion is configuredto limit rotation and axial movement of the hub relative to the proximalhousing. The distal housing defines a proximal interior portion and adistal interior portion. The proximal interior portion is configured toreceive at least part of the distal portion of the proximal housing. Thedistal housing is configured to latch to the proximal housing so thatthe distal and proximal housings cooperate to limit axial movement ofthe hub relative to the distal and proximal housings.

In certain implementations, the optical cable has a jacket terminated ata cable anchor. The optical fiber extends distally beyond the cableanchor. The proximal portion of the proximal housing is configured tocouple to the anchor member to limit rotation and axial movement of theanchor member relative to the proximal housing.

In some examples, the anchor member is positioned at the ferrule hub. Inother examples, the anchor member is spaced along the optical fiber ofthe fiber optic arrangement from the ferrule hub.

In some implementations, the fiber optic arrangement includes a springpre-mounted over the hub at a factory during manufacturing. In otherimplementations, a spring mounts over the ferrule hub in the fieldduring installation.

In certain implementations, the proximal housing defines a first slotseparated from a second slot by an abutment member, wherein the hub isinserted into the distal portion of the proximal housing until a key ofthe keying member engages the abutment member of the proximal housing.In certain examples, the key of the keying member includes two spacedapart stop members, and wherein the key of the keying member engages theabutment member when one of the stop members passes beyond the abutmentinto the first slot while the other of the stop members remains in thesecond slot with the abutment member disposed in between the stopmembers.

In certain implementations, the distal portion of the proximal housinghas a smaller cross-dimension than the proximal portion

In certain implementations, the proximal housing defines slots sized toreceive tabs of the anchor member.

In certain implementations, the proximal housing includes tabs thatlatch into slots defined in the distal housing to latch the proximalhousing to the distal housing. In certain examples, the tabs definearrow heads.

In certain implementations, the distal housing defines an interior keyedregion that mates with a keyed portion of the hub separate from thekeying member.

In certain implementations, interaction between the keyed portion of thehub and the interior keyed region, interaction between the tabs and theslots, and interaction between the key of the keying member and theproximal interior portion of the distal housing restricts insertion of acombination of the fiber optic arrangement and the proximal housing intothe distal housing to only one rotational orientation.

In certain implementations, the proximal housing has a frustro-conicalshaped proximal end.

In certain implementations, a grip housing that mounts over the distalhousing.

Other aspects of the disclosure relate to a method of connecting anoptical fiber of an optical network to a demarcation point in the field.The method includes obtaining a fiber optic arrangement including anoptical fiber including an optical fiber having a polished tip held atan optical ferrule, the optical fiber arrangement having a largest outerdiameter of no more than 4 mm; routing the fiber optic arrangementthrough a duct having a maximum inner diameter of no more than 4 mm; andassembling an optical connector body around the polished tip of thefiber optic arrangement by sandwiching the optical ferrule between aproximal housing and a distal housing of the optical connector to forman assembled optical connector.

In certain implementations, routing the fiber optic arrangement includesassembling a protective arrangement around the fiber optic arrangement,the protective arrangement including a first housing and second housingthat cooperate to enclose the fiber optic arrangement; and pushing theprotective arrangement through the duct.

In certain implementations, the polished tip is tuned relative to aferrule hub coupled to the optical ferrule.

Other aspects of the disclosure relate to an assembled fiber opticconnector including a fiber optic arrangement including an optical fiberhaving a prepared fiber tip held by an optical ferrule arrangement; aproximal housing disposed over the optical fiber, the proximal housingdefining an interior spring stop and an exterior catch member; a springdisposed over the optical fiber; and a distal housing having an openrear through which the fiber optic arrangement, spring, and proximalhousing can be inserted. The spring has a first end engaging a springstop defined by the optical ferrule arrangement and a second endengaging the spring stop defined by the proximal housing. The distalhousing defines an aperture configured to latchably receive the exteriorcatch member of the proximal housing.

Other aspects of the disclosure relate to a factory assembled opticalfiber arrangement including an optical ferrule extending from a firstend to a second end; an optical fiber having a first end defining afiber tip, a ferrule hub coupled to the second end of the ferule, and adust cap mounted to the first end of the optical ferrule to cover thefiber tip. The optical fiber extends through the optical ferrule fromthe second end to the first end. The fiber tip is accessible from thefirst end of the optical ferrule. The fiber tip is polished. The fibertip is tuned relative to the optical ferrule. The ferrule hub has aforward portion and a rearward portion. The forward portion defines flatsurfaces around a circumference of the ferrule hub. One of the flatsurfaces is marked to indicate a tuning orientation of the optical fibertip. The forward portion has a largest outer diameter of no more than 4mm. The dust cap physically contacts the optical ferrule and does notphysically contact the ferrule hub. The dust cap has a largest outerdiameter that is less than 4 mm, the dust cap being configured toreceive a pulling lead.

Other aspects of the disclosure relate to a fiber optic arrangementincluding an optical cable; an optical ferrule arrangement; a keyingmember; and a cable anchor. The optical cable has a fiber, a strengthlayer, and a jacket surrounding the fiber and the strength layer. Thejacket is terminated so that a portion of the fiber is exposed. Theportion of the fiber has a prepared fiber tip spaced from the terminatedjacket. The optical ferrule arrangement holds the prepared fiber tip ata location spaced along the fiber from the terminated jacket. Theoptical ferrule arrangement also includes a hub. The keying member isinstalled on the hub in a particular rotational orientation based on atuning analysis. The keying member includes a key to inhibit rotation ofthe keying member relative to the hub. The cable anchor is mounted overthe cable at the terminated jacket. The cable anchor is spaced along theoptical fiber from the optical ferrule arrangement. The cable anchor hasa radially extending end wall and an annular wall extending axially fromthe end wall. The end wall defines an aperture through which the fiberextends, the annular wall extending over the jacket of the opticalcable. The annular wall includes a tab defining a shoulder facing awayfrom the optical ferrule arrangement.

Other aspects of the disclosure relate to a fiber optic connectorincluding a distal housing defining a proximal interior portion and adistal interior portion, the proximal interior portion defining a keyedregion, the distal housing defining slots with distal open ends; aproximal housing having a proximal portion and a distal portion, thedistal portion sized to fit within the proximal interior portion of thedistal housing, the proximal housing including tabs that fit within theslots of the distal housing to retain the proximal housing at the distalhousing; a ferrule hub disposed within the proximal interior portion ofthe distal housing and within the distal portion of the proximalhousing, the ferrule hub including a first keyed portion, a secondportion, and a spring support portion, the first keyed portion matingwith the keyed region of the distal housing; a keying member mounted tothe second portion of the hub in a rotationally fixed position, thekeying member being rotationally fixed relative to the proximal housing,the keying member being engaged with the proximal housing so as toenable limited travel of the keying member relative to the proximalhousing; and a spring mounted over the third portion of the hub, thespring abutting an interior spring stop defined by the proximal housing.

A variety of additional inventive aspects will be set forth in thedescription that follows. The inventive aspects can relate to individualfeatures and to combinations of features. It is to be understood thatboth the forgoing general description and the following detaileddescription are exemplary and explanatory only and are not restrictiveof the broad inventive concepts upon which the embodiments disclosedherein are based.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute apart of the description, illustrate several aspects of the presentdisclosure. A brief description of the drawings is as follows:

FIG. 1 is a schematic representation of a fiber optic network disposedin a facility;

FIG. 2 is a schematic representation of an example residence R includingwalls and a floor defining a room in the facility of FIG. 1;

FIG. 3 illustrates a fiber optic arrangement including an optical fiberhaving a fiber tip held at an optical ferrule, which is coupled to aferrule hub in accordance with the principles of the present disclosure;

FIG. 4 is a perspective view of the optical fiber arrangement of FIG. 1with a dust cap mounted over the optical ferrule;

FIGS. 5 and 6 illustrate another example dust cap suitable for use tocover the optical fiber tip of the fiber optic arrangement;

FIG. 7 is a perspective view of an example optical connector with thecomponents axially exploded away from each other for ease in viewing;

FIG. 8 illustrates the optical connector of FIG. 7 partially assembledover the optical fiber arrangement of FIG. 3;

FIG. 9 is a perspective view of the optical connector and optical fiberarrangement of FIG. 8 fully assembled as a connectorized fiber end;

FIG. 10 is an axial cross-section of the connectorized fiber end of FIG.9;

FIG. 11 is a perspective view of another example optical connector withthe components axially exploded away from each other for ease inviewing;

FIG. 12 is a perspective view of an example fiber optic arrangement thatis connectorized in FIG. 11;

FIG. 13 is a perspective view of an example keying member suitable foruse with the fiber optic arrangement of FIG. 12 and optical connector ofFIG. 11;

FIG. 14 is a perspective view of the assembled connector of FIG. 11;

FIG. 15 is a perspective view of another example optical connector withthe components axially exploded away from each other for ease inviewing;

FIG. 16 is an axial cross-section of an example cable anchor suitablefor use with the optical connector of FIG. 15;

FIG. 17 is a perspective view of the assembled optical connector of FIG.15;

FIG. 18 is an axial cross-sectional view of the assembled opticalconnector of FIG. 17;

FIG. 19 is a perspective view of an example protective arrangementsuitable for use in covering the fiber optic arrangement of FIG. 3 or 12during installation;

FIG. 20 is a perspective view of another example fiber optic arrangementdisposed within a protective arrangement;

FIG. 21 is a front perspective view of example components of a fiberoptic connector configured to be installed about the fiber opticarrangement of FIG. 20;

FIG. 22 is a rear perspective view of the fiber optic connector formedby installing the components of FIG. 21 about the fiber opticarrangement of FIG. 20;

FIG. 23 is an axial cross-sectional view of the fiber optic connector ofFIG. 22;

FIG. 24 is an axial cross-sectional view of the fiber optic connector ofFIG. 22 rotated 90° from the cross-sectional view of FIG. 23;

FIG. 25 is a front perspective view of example components of anotherfiber optic connector configured to be installed about the fiber opticarrangement of FIG. 20;

FIG. 26 is a rear perspective view of the fiber optic connector formedby installing the components of FIG. 25 about the fiber opticarrangement of FIG. 20;

FIG. 27 is a perspective view of an example proximal housing suitablefor use with the connector components of FIG. 26;

FIG. 28 is a rear perspective view of the fiber optic connector formedby installing the components of FIG. 26 about the fiber opticarrangement of FIG. 20;

FIG. 29 is an axial cross-sectional view of the fiber optic connector ofFIG. 28;

FIG. 30 illustrates a fiber optic arrangement including an optical fiberhaving a fiber tip held at an optical ferrule, which is coupled to aferrule hub in accordance with the principles of the present disclosure;

FIG. 31 is an exploded, perspective view of the fiber optic arrangementof FIG. 30;

FIG. 32 is a perspective view of an example protective arrangementassembled around the fiber optic arrangement of FIG. 30;

FIG. 33 shows the pieces of the protective arrangement of FIG. 32exploded away from the fiber optic arrangement;

FIG. 34 is a plan view of a piece of the protective arrangement of FIG.33;

FIG. 35 shows the protective arrangement of FIG. 32 partially assembledaround the fiber optic arrangement of FIG. 30;

FIG. 36 is an axial cross-sectional view of the protective arrangementand fiber optic arrangement of FIG. 32;

FIG. 37 illustrates a spreader opening the proximal end of an examplestrain-relief boot;

FIG. 38 is a perspective view of an example connector including a distalhousing and a proximal housing, the view showing the components of theconnector exploded away from the fiber optic arrangement of FIG. 32;

FIG. 39 is a perspective view of the proximal housing of FIG. 38;

FIG. 40 is an axial cross-section of the proximal housing of FIG. 39;

FIG. 41 is an axial cross-section of the distal housing of FIG. 38;

FIG. 42 is a perspective view of the assembled optical connector of FIG.38; and

FIG. 43 is an axial cross-sectional view of the assembled opticalconnector of FIG. 42.

DETAILED DESCRIPTION

Reference will now be made in detail to exemplary aspects of the presentdisclosure that are illustrated in the accompanying drawings. Whereverpossible, the same reference numbers will be used throughout thedrawings to refer to the same or like parts.

The present disclosure is directed to a fiber optic arrangement that isassembled in a factory. In certain implementations, the fiber opticarrangement includes an optical fiber having a fiber tip that is coupledto an optical ferrule, prepared, and protected at the factory. Forexample, the fiber tip can be tuned and polished at the factory and adust cap can be mounted to the optical ferrule to cover and protect thefiber tip. The fiber optic arrangement is routed to a demarcation point(e.g., an ONT, a wall outlet, etc.) when installed in the field. At thedemarcation point, the fiber optic arrangement is assembled with anoptical connector body to form a connectorized end of the optical fiber.To plug the connectorized end into the ONT, wall outlet, or otherconnection point, the dust cap is removed to provide access to the fibertip.

FIG. 1 is a schematic representation of a fiber optic network 200disposed in a facility F. In examples, the facility F includes multipleindividual residences R (e.g., apartments, condominiums, businesses,etc.). In the example shown, the facility F includes five floors,including a basement, that each have one or more residences R locatedthereat. In other examples, the facility F can have a greater or lessernumber of floors.

The fiber optic network 200 includes a feeder cable 202 from a centraloffice (not shown). The feeder cable 202 enters a feeder cable inputlocation 204 (e.g., a fiber distribution hub, a network interfacedevice, etc.) disposed at the facility F (e.g., in the basement of thefacility). The fiber distribution hub 204 has one or more opticalsplitters (e.g., 1-to-8 splitters, 1-to-16 splitters, or 1-to-32splitters) that generate a number of individual fibers.

At least one fiber optic enclosure 206 is mounted at each floor of thefacility F. In the example shown, a fiber optic enclosure 206 is mountedat each floor above the basement. The individual fibers generated by theoptical splitters are routed to the fiber optic enclosures 206 via oneor more riser cables 208. Examples of fiber optic enclosures 206suitable for use in the fiber optic network 200 can be found in U.S.Publication No. 2013/0094828, the disclosure of which is herebyincorporated herein by reference in its entirety.

Subscriber cables 210 are routed from the fiber optic enclosures 206 torespective residences R. The subscriber cable 210 includes an opticalfiber disposed in a jacket or protective tubing. For example, thesubscriber cable 210 can include any of the fiber optic arrangements100, 300 that will be described herein. In some implementations, thesubscriber cable 210 is routed to a transition box at the respectiveresidence R. In other examples, the subscriber cable 210 is routedthrough the walls of the residence R (e.g., within ducts) towards a walloutlet 212. For example, the fiber optic arrangement 100 can be routedthrough the walls of the residence R towards the wall outlet 212, ONT,or other demarcation point.

FIG. 2 is a schematic representation of an example residence R includingwalls and a floor defining a room. A wall box 212 is disposed at adesirable location within the residence R for optical and/oroptoelectronic equipment. In some implementations, the subscriber cable210 extends through ducts in the wall and enters the residence R behindthe wall outlet 212. The subscriber cable 210 can have a partiallyterminated end as described above that is fully connectorized with anoptical connector body in the field and plugged into a port at the walloutlet 212. Partially terminated ends can be advantageously routedthrough small ducts to facilitate passage through walls of the residenceR. The partially terminated end can be quickly installed in the fieldwithout tools, such as an optical fusion splicer.

The wall box 212 serves as a demarcation point within the residence Rfor the optical service provider. The subscriber cable 210 is opticallycoupled to an optical connector at the wall outlet 212. Accordingly,optical signals carried by the subscriber cable 210 are available at theoptical connector.

A user can choose to connect an optical network terminal (ONT) 214 orother equipment to the connector of the wall outlet 212 to connect theONT 214 or other equipment to the fiber optic network 200. For example,a jumper cable 216 can extend between the ONT 214 and the wall outlet212. The ONT 214 also can have a power cord 218 that plugs into anelectrical outlet to provide power to the ONT 214.

FIG. 19 illustrates an example protective arrangement 500 that can bemounted around any of the fiber optic arrangements 100, 300 disclosedherein. For ease in viewing, FIG. 19 shows the protective arrangement500 disposed about the fiber optic arrangement 100. It will beunderstood, however, that the protective arrangement 500 can be usedwith the fiber optic arrangement 300. The protective arrangement 500 canthen be pulled or pushed through the duct. In certain implementations,the protective arrangement 500 includes a first housing piece 510 a anda second housing piece 510 b that cooperate to enclose the fiber opticarrangement 100.

Each housing piece 510 a, 510 b defines a cavity 511 sized and shaped toaccommodate the components of the fiber optic arrangement 100. Forexample, the cavity 511 may be sized and shaped to accommodate theferrule 110, dust cap 120, and ferrule hub 115 after termination of theoptical fiber. In certain examples, the cavity 511 is sized and shapedto accommodate the keying member 360 of FIGS. 11-18. In certainexamples, the cavity 511 is sized and shaped to accommodate the spring135, 335 of FIGS. 7 and 11. In certain examples, the cavity 511 is sizedand shaped to accommodate the cable anchor 470 of FIG. 15. In certainimplementations, the protective arrangement 500 is assembled about thefiber optic arrangement 100 in the factory after termination of theoptical fiber 105 at the ferrule 110 and before shipping of the fiberoptic arrangement 100 to an installation site.

In certain implementations, the housing pieces 510 a, 510 b definealignment keys that aid in mating the housing pieces 510 a, 510 b. Inthe example shown, the alignment keys include pegs 512 and holes 513. Inother implementations, other types of alignment keys can be used. Incertain implementations, the forward end of the protective arrangement500 defines a tapered nose 514 to aid in navigation through ducts. Incertain implementations, the tapered nose 514 defines an aperture 515. Apulling string could be inserted through the aperture to attach thepulling string to the protective arrangement 500, thereby allowing theprotective arrangement 500 to be pulled through the housing.Alternatively, the protective arrangement 500 could be pushed throughthe housing using a stiffening member. Examples of various pushingtechniques for use with the protective arrangement 500 are shown in U.S.Application No. 62/268,379, filed Dec. 16, 2015, and titled“Arrangements for Pushing and Pulling Cables; and Methods,” thedisclosure of which is incorporated herein by reference in its entirety.

FIG. 3 illustrates an example fiber optic arrangement 100 including anoptical fiber 105, a ferrule 110, and a ferrule hub 115. The fiber opticarrangement 100 has a largest outer diameter of no more than 4 mm. Incertain implementations, the fiber optic arrangement 100 has a largestouter diameter of no more than 3.8 mm. In certain implementations, thefiber optic arrangement 100 has a largest outer diameter of no more than3.7 mm. In certain implementations, the fiber optic arrangement 100 hasa largest outer diameter of no more than 3.6 mm. In certainimplementations, the fiber optic arrangement 100 has a largest outerdiameter of no more than 3.5 mm.

A first end 101 of the optical fiber 105 is terminated at the ferrule110 in a fiber processing procedure. For example, the first end 101 ofthe optical fiber 105 can be inserted into the ferrule 110 from a rearof the ferrule 110 so that a fiber tip is accessible from a front end ofthe ferrule 110. The first end 101 of the optical fiber 105 can besecured to the ferrule. For example, epoxy can be inserted into theferrule from the rear to coat a bare portion of the fiber (i.e., aportion from which the coating has been stripped). In certain examples,the epoxy also can coat strength members (e.g., aramid yarns) formingpart of the optical fiber 105. The epoxy is cured to secure the fiber105 to the ferrule 110. The secured fiber tip can be tuned (e.g., amarking can be made to the ferrule 110 or ferrule hub 115 to indicate atuning direction). The secured fiber tip can be polished.

A ferrule hub 115 can be disposed on the fiber optic arrangement 100 tosurround the rear of the ferrule 110 and a portion of the fiber 105extending out of the rear of the ferrule 110. In certainimplementations, the ferrule hub 115 defines the largest outer diameterof any part of the fiber optic arrangement 100. In certainimplementations, the ferrule hub 115 includes a forward section 116 anda rearward section 117. The forward section 116 surrounds the rear ofthe ferrule 110. The rearward section 117 surrounds the optical fiber105.

In certain implementations, the forward section 116 has a larger outerdiameter than the rearward section 117. In certain examples, a radialstep 118 transitions the forward section 116 to the rearward section117. In certain examples, the forward section 116 has a leading taper119 facing forwardly. In certain implementations, the forward section116 defines the largest outer diameter of the ferrule hub 115. Incertain implementations, the outer diameter of the forward section 116is no more than 3.8 mm. In certain implementations, the outer diameterof the forward section 116 is no more than 3.7 mm. In certainimplementations, the outer diameter of the forward section 116 is nomore than 3.6 mm. In certain implementations, the outer diameter of theforward section 116 is no more than 3.5 mm.

In certain implementations, the forward section 116 of the ferrule hub110 defines one or more flat surfaces 116 a. In certain implementations,the forward section 116 defines at least two flat surfaces 116 a. In theexample shown, the forward section 116 defines six flat surfaces 116 a.In certain examples, the flat surfaces 116 a are configured to be markedto indicate a tuning orientation of the optical fiber arrangement 100.For example, a mark can be made on the flat surface 116 a to indicate atuning direction. In certain implementations, the outer diameter of theforward section measured at the flat surfaces 116 a is no more than 3.5mm. In certain implementations, the outer diameter of the forwardsection measured at the flat surfaces 116 a is no more than 3.4 mm. Incertain implementations, the outer diameter of the forward sectionmeasured at the flat surfaces 116 a is no more than 3.3 mm.

As shown in FIG. 4, in certain implementations, the optical fiber tipand ferrule 110 are cleaned and a dust cap 120 is disposed over thefront of the ferrule 110 to cover the fiber tip. In an example, the dustcap 120 is friction fit to the ferrule 110 in an axially fixed positionuntil a predetermine amount of axial force is applied to the dust cap120. In certain implementations, the fiber processing procedure, frominsertion of the fiber into the ferrule to mounting the dust cap, occursin a factory. The dust cap 120 maintains the cleanliness of the fibertip during shipping and installation. The dust cap 120 includes a mainbody 121 covering at least the front of the ferrule 110. A necked downportion 122 of the main body 121 steps or tapers radially inwardly todefine an annular groove. A front portion 123 of the main body 121 stepsor tapers radially outwardly to define a pulling stop 123. In otherimplementations, the front of the dust cap 120 can define a hook orloop.

The fiber optic arrangement 100 can be coiled, boxed, or otherwisestored or packaged until installation is desired. To install the fiberoptic arrangement 100 (e.g., at a dwelling), a pulling lead 125 can besecured to the dust cap 120. In the example shown, the pulling lead 125can be wrapped around and secured at the groove defined at the neckeddown portion 122 of the dust cap. Pulling on the pulling lead 125 causesthe pulling lead 125 to abut the pulling stop 123, thereby pulling thefiber optic arrangement 100. Accordingly, the pulling lead 125 can beutilized to pull the fiber optic arrangement 100 through a hole, duct,or other path.

In certain implementations, the hole, duct, or other path through whichthe fiber optic arrangement 100 is pulled has a maximum internaldiameter of no more than 4 mm. In certain implementations, the hole,duct, or other path through which the fiber optic arrangement 100 ispulled has a maximum internal diameter of no more than 4.1 mm. Incertain implementations, the hole, duct, or other path through which thefiber optic arrangement 100 is pulled has a maximum internal diameter ofno more than 4.2 mm. In certain implementations, the hole, duct, orother path through which the fiber optic arrangement 100 is pulled has amaximum internal diameter of no more than 3.9 mm. In certainimplementations, the hole, duct, or other path through which the fiberoptic arrangement 100 is pulled has a maximum internal diameter of nomore than 3.8 mm. In certain implementations, the hole, duct, or otherpath through which the fiber optic arrangement 100 is pulled has amaximum internal diameter of no more than 3.7 mm. In certainimplementations, the hole, duct, or other path through which the fiberoptic arrangement 100 is pulled has a maximum internal diameter of nomore than 4.3 mm. In certain implementations, the hole, duct, or otherpath through which the fiber optic arrangement 100 is pulled has amaximum internal diameter of no more than 4.4 mm. In certainimplementations, the hole, duct, or other path through which the fiberoptic arrangement 100 is pulled has a maximum internal diameter of nomore than 4.5 mm.

After exiting the hole, duct, or other pathway, the first end 101 of thefiber optic arrangement 100 is connectorized by inserting the first end101 into an optical connector 130. Accordingly, the first end 101 of thefiber optic arrangement 100 can be optically coupled to another fiberoptic connector at a connection site. In the example shown, the firstend 101 of the fiber optic arrangement 100 is connectorized with an SCconnector. In other implementations, however, the first end 101 of thefiber optic arrangement 100 can be connectorized with an LC connector,an ST connector, an FC connector, an LX.5 connector, or any otherdesired connector.

FIGS. 5 and 6 illustrate another example dust cap 120′ suitable for useto cover the optical fiber tip of the fiber optic arrangement 100. Thedust cap 120′ is configured to be friction fit to the ferrule 110 in anaxially fixed position until a predetermined amount of axial force isapplied to the dust cap 120′. In certain implementations, the fiberprocessing procedure, from insertion of the fiber into the ferrule tomounting the dust cap, occurs in a factory. The dust cap 120′ maintainsthe cleanliness of the fiber tip during shipping and installation.

The dust cap 120′ includes a main body 121′ covering at least the frontof the ferrule 110. A necked down portion 122′ of the main body 121′steps or tapers radially inwardly to define an annular groove. A pullinglead 125 (e.g., see FIG. 4) can be wrapped around and secured at thegroove defined at the necked down portion 122′ of the dust cap 120′. Afront portion 123′ of the main body 121′ steps or tapers radiallyoutwardly to define a pulling stop 123′. In other implementations, thefront of the dust cap 120′ can define a hook or loop.

An open end of the main body 121′ leads to an interior of the dust cap120′. A portion 126′ of the interior is configured to receive theferrule 110. In certain implementations, at least a portion of aninterior surface 124′ of the ferrule-receiving portion 126′ extendsradially inwardly. For example, the interior surface 124′ may extendsufficiently inwards so that a smallest interior dimension (e.g., innerdiameter) of the ferrule-receiving portion 126′ is less than an outerdimension (e.g., outer diameter) of the ferrule.

In some examples, the portion 128′ of the interior surface 124′ maytaper radially inwardly as the interior surface 124′ extends towards theopen end of the main body 121′. In other examples, the portion 128′ maydefine a bump, hook, or other such shape. In certain examples, theportion 128′ of the interior surface 124′ extends over less than amajority of a length of the ferrule-receiving portion 126′. In examples,the portion 128′ of the interior surface 124′ extends over no more thana third of the ferrule-receiving portion 126′. In examples, the portion128′ of the interior surface 124′ extends over no more than a fourth ofthe ferrule-receiving portion 126′.

An axial notch 125′ extends from the open end of the main body 121′ toan intermediate location along the length of the main body 121′. Incertain examples, the axial notch 125′ extends along at least a majorityof the length of the ferrule-receiving portion 126′ of the main body121′. The notch 125′ allows the main body 121′ to flex radiallyoutwardly at the open end sufficient to enable passage of the ferrule110 past the radially inwardly extending portion 128′ and into theinterior of the dust cap 120′. The resilient main body 121′ applies aradially inwardly directed spring force to the ferrule 110. This springforce helps to maintain the ferrule 110 within the interior of the dustcap 120′ despite axial pull on the dust cap 120′ relative to the ferrule110 during installation. The notch 125′ is sized so that the springforce can be overcome without the use of tools when removing the dustcap 120′ from the ferrule 110 when connection is desired.

FIG. 7 illustrates one example of a fiber optic connector 130. In someimplementations, the fiber optic connector 130 includes a distal housing150, a spring 135, and a proximal housing 140. When the connector 130 isassembled, the first end 101 of the fiber optic arrangement 100 and thespring 135 are sandwiched between the proximal housing 140 and thedistal housing 150. For example, the forward section 116 of the ferulehub 115 abuts an interior stop defined by the distal housing 150 (e.g.,see FIG. 10). A first axial end 136 of the spring 135 abuts the radialstep 118 of the ferrule hub 115 of the fiber optic arrangement 100 and asecond axial end 137 of the spring 135 abuts a spring stop 143 withinthe rear housing 140 (FIG. 10). Accordingly, the spring 135 biases theferrule 110 and fiber tip forwardly relative to the distal housing 150while allowing for limited rearward axial movement of the ferrule 110and fiber tip relative to the distal housing 150.

As shown in FIG. 8, the proximal housing 140 and spring 135 areconfigured to be mounted to the optical fiber 105 when the first end 101of the fiber optic arrangement 100 has been routed to the demarcationpoint (e.g., a site at which the optical fiber is to be connected in thefield). For example, the spring 135 may be a coil spring. In such anexample, the optical fiber 105 may be laterally inserted between twoadjacent coils of the spring 135. The spring 135 can then be rotated bya user so that the optical fiber 105 threads down between the coilsuntil the optical fiber 105 reaches one end of the spring 135. The userthen reverses the rotation direction of the spring 135 relative to theoptical fiber 105 to thread the spring 135 onto the optical fiber 105until the optical fiber 105 extends axially through the coils of thespring 135 (see FIG. 8).

The proximal housing 140 includes a body 141 defining an axial slot 142extending from a front of the body 141 to a rear of the body 141.Accordingly, the proximal housing 140 is mounted to the optical fiber105 by sliding the optical fiber 105 through the axial slot 142. Incertain implementations, the body 141 is resilient and the slot 142 issized so that the optical fiber 105 pushes edges of the body 141outwardly to enlarge the slot 142 as the fiber 105 passes through theslot 142. Accordingly, the proximal housing 140 inhibits removal of thefiber 105 after snapping over the fiber 105.

The proximal housing 140 defines a frustro-conical tail 144 thataccommodates lateral pulling and bending of the optical fiber 105 as thefiber 105 exits the proximal housing 140. In some implementations, therear of the proximal housing 140 is configured to mitigate the need fora separate strain-relief boot at the rear of the fiber optic connector130. For example, the frustro-conical tail 144 may obviate the need fora separate strain-relief boot. Accordingly, the example fiber opticconnector 130 shown in FIGS. 9 and 10 does not include a separatestrain-relief boot.

The proximal housing 140 also includes one or more catch members 145configured to mate with receiving members of the distal housing 150. Incertain implementations, the proximal housing 140 includes two catchmembers 145 positioned on opposite sides of the proximal housing 140. Incertain implementations, the catch members 145 of the proximal housing140 are elongated between the front and rear of the proximal housing140. In certain implementations, the catch members 145 define catchsurfaces 146. In certain examples, the catch members 145 definerearwardly facing catch surfaces 146. In an example, each catch member145 is shaped as an arrow having a forwardly pointing arrowhead.Accordingly, the catch members 145 may facilitate alignment of theproximal housing 140 with the distal housing 150.

The distal housing 150 defines an interior accessible from a rearwardend 152. The first end 101 of the fiber optic arrangement 100, thespring 135, and at least a forward portion of the proximal housing 140are inserted into the interior through the rearward end 152. The distalhousing 150 also defines catch apertures 154 configured to align withthe catch members 145 of the proximal housing 140. In certain examples,the catch apertures 154 are elongated between the front and rear of thedistal housing 150. Each catch aperture 154 defines catch surfaces 154 bconfigured to engage the catch surfaces 146 of the catch members 145 ofthe proximal housing 140 when the proximal housing 140 is axiallysecured to the distal housing 150. In certain examples, each catchaperture 154 defines a narrow path 154 a leading to a larger opening 154c. The catch surfaces 154 b are defined at the transition between thenarrow path 154 a and the larger opening 154 c.

During assembly of the connector 130, the proximal housing 140 isinserted into the distal housing 150 so that the arrowhead of the catchmembers 145 passes through the narrow path 154 a. When the arrowheadreaches the larger opening 154 c, the catch surfaces 146 of the catchmembers 145 engage the catch surfaces 154 b of the catch apertures 154,thereby restraining rearward axial movement of the proximal housing 140relative to the distal housing 150. Accordingly, the proximal housing140 restrain rearward axial movement of the spring 135 and fiber opticarrangement 100 relative to the distal housing 150.

In some implementations, the distal housing 150 includes multiplehousing pieces movable relative to each other. In the example shown, thedistal housing 150 defines an SC plug housing including an inner body151 and an outer body 156. The inner body 151 defines the rear opening152 through which the first end 101 of the fiber optic arrangement 100,spring 135, and proximal housing 140 pass. The inner body 151 defines anaperture 151 a through which a tuning mark on the ferrule hub 115 isvisible. For example, a marking on the flat 116 a on the forward portion116 of the hub 115 is visible to a user through the aperture 151 a whenthe fiber optic arrangement 100 is installed in the inner housing 151 inthe correct rotational orientation.

The inner body 151 also defines the catch apertures 154. The inner body151 also defines the interior stop that the forward end 116 of the hub115 abuts. In certain implementations, a forward end 153 of the innerhousing is inserted into the outer housing 156 through a rear end 157 ofthe outer housing 156. In certain implementations, wings 155 of theinner housing 151 latch into apertures 158 defined by the outer housing156 (e.g., see FIG. 9). In other implementations, the inner housing 151otherwise axially and rotationally secures to the outer housing 156. Inother implementations, the distal housing 150 is integrally formed orformed from parts that are axially and rotationally fixed relative toeach other.

In certain examples, the assembled optical connector 130 does notinclude a strain-relief boot. In certain examples, the assembled opticalconnector 130 does not include a crimp sleeve.

FIGS. 11-14 illustrate another example of a fiber optic connector 330assembled about another example fiber optic arrangement 300. In someimplementations, the fiber optic connector 330 includes a distal housing350, a spring 335, and a proximal housing 340 (FIG. 11). When theconnector 330 is assembled, the fiber optic arrangement 300 and thespring 335 are sandwiched between the proximal housing 340 and thedistal housing 350. The example fiber optic arrangement 300 includes anoptical fiber 305, a ferrule 310, and a ferrule hub 315 (FIG. 12).

In certain implementation, the fiber optic arrangement 300 includes akeying member 360 (FIG. 13) to lock the fiber optic arrangement 300 tothe connector 330 at a particular rotational orientation. For example,the keying member 360 can be positioned on the fiber optic arrangement300 in a particular rotational orientation based on a tuning analysis.The keying member 360 is structured to inhibit rotation of the keyingmember 360 relative to the fiber optic arrangement 300. The keyingmember 360 also is structured to inhibit rotation of the keying member360 relative to the connector 330 when the connector 330 is assembled.In certain implementations, the keying member 360 and connector 330 arestructured so that the connector 330 can only be assembled around thefiber optic arrangement 300 in one rotational configuration as will bedescribed in more detail herein.

The fiber optic arrangement 300 has a largest outer diameter of no morethan 4 mm. In certain implementations, the fiber optic arrangement 300has a largest outer diameter of no more than 3.8 mm. In certainimplementations, the fiber optic arrangement 300 has a largest outerdiameter of no more than 3.7 mm. In certain implementations, the fiberoptic arrangement 300 has a largest outer diameter of no more than 3.6mm. In certain implementations, the fiber optic arrangement 300 has alargest outer diameter of no more than 3.5 mm.

The optical fiber 305 is terminated at the ferrule 310 (e.g., at thefactory) as described above with reference to the optical fiber 105 andferrule 110. In certain implementations, the optical fiber tip andferrule 310 are cleaned and a dust cap 320 is disposed over the front ofthe ferrule 310 to cover the fiber tip. The ferrule hub 315 surroundsthe rear of the ferrule 310 and a portion of the fiber 305 extending outof the rear of the ferrule 310. In certain implementations, the ferrulehub 315 includes a forward section 316 and a keying section 317 (seeFIG. 12) rearward of the forward section 316. The forward section 316has a larger outer dimension than the keying section 317.

In certain implementations, the forward section 316 defines one or moreflat surfaces 316 a (FIG. 12). In certain implementations, the forwardsection 316 defines at least two flat surfaces 316 a. In the exampleshown, the forward section 316 defines six flat surfaces 316 a. Incertain examples, the flat surfaces 316 a are configured to be marked toindicate a tuning orientation of the optical fiber arrangement 300. Forexample, a mark can be made on the flat surface 316 a to indicate atuning direction. In certain implementations, the outer diameter of theforward section measured at the flat surfaces 316 a is no more than 3.5mm. In certain implementations, the outer diameter of the forwardsection measured at the flat surfaces 316 a is no more than 3.4 mm. Incertain implementations, the outer diameter of the forward sectionmeasured at the flat surfaces 316 a is no more than 3.3 mm.

As shown in FIG. 12, in certain implementations, the keying section 317of the ferrule hub 315 defines one or more flat surfaces 317 a. Incertain implementations, the rearward section 317 defines at least twoflat surfaces 317 a. In the example shown, the rearward section 317defines six flat surfaces 317 a. In certain implementations, the keyingsection 317 defines the rear of the ferrule hub 315. In otherimplementations, the ferrule hub 315 defines a rear section 319 disposedrearward of the keying section 317. In certain examples, the rearsection 319 provides at least partially support for the spring 335. Incertain examples, at least a portion of the rear section 319 has across-dimension larger than a cross-dimension of the keying section 317.

As also shown in FIGS. 12 and 13, the keying member 360 includes a body361 defining an axial passage through which the fiber 305 passes. Thebody 361 and passage are sized to fit around the keying section 317 ofthe hub 315. In certain examples, the body 361 defines an axial slot 362that extends from the passage to an exterior of the body 361. The axialslot 362 enables the passage to expand sufficiently to pass over therear section 319 of the hub 315 (or to be mounted laterally on thekeying section 317).

An interior of the passage defines flat surfaces 363 that are sized andshaped to fit with the flat surfaces 317 a of the keying section 317 ofthe hub 315. In the example shown, the passage has a hexagonal shape. Inother examples, however, the passage can have any number of flatsurfaces 317 a. The engagement between the flat surfaces 363 of thekeying member 360 and the flat surfaces 317 a of the hub 315 inhibitrotation of the keying member 360 relative to the hub 315. Accordingly,the keying member 360 can be mounted to and maintained on the hub 315 ina particular rotational configuration.

The keying member 360 also includes an alignment member 365 at anexterior of the body 361. In certain implementations, the keying member360 is mounted to the hub 315 so that the alignment member 365 indicatesa tuning direction of the optical fiber 305. In certain implementations,the keying member 360 is configured to secure to the rear housing 340 toinhibit rotation of the keying member 360 relative to the rear housing340. In the example shown in FIG. 11, the rear housing 340 defines anaperture 348 sized to receive the alignment member 365 of the keyingmember 360. The example alignment member 360 shown in FIG. 13 defines arearwardly-facing ramp 366 and a forwardly-facing shoulder 377.Accordingly, a forward portion of the rear housing 340 can cam over theramp 366 and snap over the shoulder 377.

In certain implementations, the keying member 360 defines the largestcross-dimension of the fiber optic arrangement 300. For example, thekeying member 360 may define the largest cross-dimension at thealignment member 365. In certain examples, the cross-dimension of thekeying member 360 at the alignment member 365 is larger than across-dimension of the forward section 316 of the hub 316.

In certain implementations, the cross-dimension of the keying member 360at the alignment member 365 is no more than 4 mm. In certainimplementations, the cross-dimension of the keying member 360 at thealignment member 365 is no more than 3.8 mm. In certain implementations,the cross-dimension of the keying member 360 at the alignment member 365is no more than 3.5 mm. In certain implementations, the cross-dimensionof the keying member 360 at the alignment member 365 is no more than 3.4mm. In certain implementations, the cross-dimension of the keying member360 at the alignment member 365 is no more than 3.3 mm.

The fiber optic arrangement 300 is connectorized by assembling thedistal housing 350 and proximal housing 340 around the fiber opticarrangement. In some implementations, the distal housing 350 includes aninner housing 351 and an outer housing 356. In such implementations, theproximal housing 340 mounts to the inner housing 351. The spring 335 isheld between a radial step 318, which transitions the forward andrearward sections 316, 317 of the ferrule hub 315, and a spring stopwithin the rear housing 340. The hub 315 abuts an interior stop definedby the distal housing 350. Accordingly, the spring 335 biases theferrule 310 and fiber tip forwardly relative to the distal housing 350while allowing for limited rearward axial movement of the ferrule 310and fiber tip relative to the distal housing 350.

The proximal housing 340 is configured to be mounted to the opticalfiber 305 when the fiber optic arrangement 300 has been routed to thedemarcation point (e.g., a site at which the optical fiber is to beconnected in the field). The proximal housing 340 includes a body 341defining an axial slot 342 extending from a front of the body 341 to arear of the body 341. Accordingly, the proximal housing 340 is mountedto the optical fiber 305 by sliding the optical fiber 305 through theaxial slot 342. The proximal housing 340 defines a frustro-conical tail344 that accommodates lateral pulling and bending of the optical fiber305 as the fiber 305 exits the proximal housing 340. In the exampleshown in FIG. 14, the example fiber optic connector 330 does not includea separate strain-relief boot.

The proximal housing 340 also includes one or more catch members 345configured to mate with receiving members of the distal housing 350. Incertain implementations, the proximal housing 340 includes two catchmembers 345 positioned on opposite sides of the proximal housing 340. Incertain implementations, the catch members 345 of the proximal housing340 are elongated between the front and rear of the proximal housing340. In certain implementations, each catch member 345 defines a catchsurface 346. In certain examples, each catch member 345 defines arearwardly facing catch surface 346. In an example, a front of eachcatch member 345 defines half an arrowhead. Accordingly, the catchmembers 345 may facilitate alignment of the proximal housing 340 withthe distal housing 350.

The distal housing 350 defines an interior accessible from a rearwardend 352. The fiber optic arrangement 300, the spring 335, and at least aforward portion of the proximal housing 340 are inserted into theinterior through the rearward end 352. The distal housing 350 alsodefines catch apertures 354 that align with the catch members 345 of theproximal housing 340. In certain examples, the catch apertures 354 areelongated between the front and rear of the distal housing 350. Eachcatch aperture 354 defines a catch surface 354 b configured to engagethe catch surface 346 of the catch member 345 of the proximal housing340. In certain examples, each catch aperture 354 defines a rampedsurface 354 a leading forwardly from the rearward end 352 of the distalhousing 350. Each catch aperture 354 also defines a resilient section354 c that facilitates flexing of the rearward end 352 of the distalhousing 350.

During assembly of the connector 330, the proximal housing 340 isinserted into the distal housing 350 so that the half arrowhead of thecatch members 345 cam along the ramps 354 a until the catch surfaces 346of the half arrowheads 345 snap over the catch surfaces 354 b of theapertures 354. Accordingly, the proximal housing 340 restrain rearwardaxial movement of the spring 335 and fiber optic arrangement 300relative to the distal housing 350.

In some implementations, the distal housing 350 includes multiplehousing pieces movable relative to each other. In the example shown, thedistal housing 350 defines an SC plug housing including an inner body351 and an outer body 356. The inner body 351 defines the rear opening352, an aperture 351 a through which a tuning mark on the ferrule hub315 is visible, and the catch apertures 354. In certain implementations,a forward end of the inner housing 351 is inserted through a rear end ofthe outer housing 356. In certain implementations, wings of the innerhousing 351 latch into apertures defined by the outer housing 356 (e.g.,see FIG. 14). In other implementations, the inner housing 351 otherwiseaxially and rotationally secures to the outer housing 356. In otherimplementations, the distal housing 350 is integrally formed or formedfrom parts that are axially and rotationally fixed relative to eachother.

FIGS. 15-18 illustrate another example of a fiber optic connector 430assembled about the example fiber optic arrangement 300 discussed abovewith respect to FIGS. 11-14. As noted above, the example fiber opticarrangement 300 includes a ferrule 310, a ferrule hub 315, a keyingmember 360, and an optical fiber 305. In certain examples, the examplefiber optic arrangement 300 can include the spring 335. In someimplementations, the fiber optic connector 430 includes a distal housing450, a spring 435, and a proximal housing 440 (FIG. 15). When theconnector 430 is assembled, the fiber optic arrangement 300 and thespring 435 are sandwiched between the proximal housing 440 and thedistal housing 450.

The distal housing 450 and the proximal housing 440 are assembled aroundthe fiber optic arrangement 300. In some implementations, the distalhousing 450 includes an inner housing 451 and an outer housing 456. Insuch implementations, the proximal housing 440 mounts to the innerhousing 451. The spring 335 is held between the ferrule hub 315 and aspring stop within the rear housing 440. The ferrule hub 315 abuts aninterior stop defined by the distal housing 450. Accordingly, the spring335 biases the ferrule 310 and fiber tip forwardly relative to thedistal housing 450 while allowing for limited rearward axial movement ofthe ferrule 310 and fiber tip relative to the distal housing 450.

The proximal housing 440 is configured to be mounted over the opticalfiber 305 when the fiber optic arrangement 300 has been routed to thedemarcation point (e.g., a site at which the optical fiber is to beconnected in the field). The proximal housing 440 includes a body 441defining an axial slot 442 extending from a front of the body 441 to arear of the body 441. Accordingly, the proximal housing 440 is mountedover the optical fiber 305 by sliding the optical fiber 305 through theaxial slot 442. The proximal housing 440 defines a frustro-conical tail444 that accommodates lateral pulling and bending of the optical fiber305 as the fiber 305 exits the proximal housing 440. In the exampleshown in FIG. 17, the example fiber optic connector 430 does not includea separate strain-relief boot.

The proximal housing 440 also includes one or more catch members 445configured to mate with receiving members of the distal housing 450. Incertain implementations, the proximal housing 440 includes two catchmembers 445 positioned on opposite sides of the proximal housing 440. Incertain implementations, the catch members 445 of the proximal housing440 are elongated between the front and rear of the proximal housing440. In certain implementations, each catch member 445 defines a catchsurface 446. In certain examples, each catch member 445 defines arearwardly facing catch surface 446. In an example, a front of eachcatch member 445 defines half an arrowhead. The catch members 445 mayfacilitate alignment of the proximal housing 440 with the distal housing450.

The distal housing 450 defines an interior accessible from a rearwardend 452. The fiber optic arrangement 300, the spring 335, and at least aforward portion of the proximal housing 440 are inserted into theinterior through the rearward end 452. The distal housing 450 alsodefines catch apertures 454 that align with the catch members 445 of theproximal housing 440. In certain examples, the catch apertures 454 areelongated between the front and rear of the distal housing 450. Eachcatch aperture 454 defines a catch surface 454 b configured to engagethe catch surface 446 of the catch member 445 of the proximal housing440. In certain examples, each catch aperture 454 defines a rampedsurface 454 a leading forwardly from the rearward end 452 of the distalhousing 450. Each catch aperture 454 also defines a resilient section454 c that facilitates flexing of the rearward end 452 of the distalhousing 450.

During assembly of the connector 430, the proximal housing 440 isinserted into the distal housing 450 so that the half arrowhead of thecatch members 445 cam along the ramps 454 a until the catch surfaces 446of the half arrowheads 445 snap over the catch surfaces 454 b of theapertures 454. Accordingly, the proximal housing 440 restrains rearwardaxial movement of the spring 335 and fiber optic arrangement 300relative to the distal housing 450.

In some implementations, the proximal housing 440 defines a forwardaperture 448 sized to receive the alignment member 365 of the keyingmember 360 of the fiber optic arrangement 300. A forward portion of therear housing 440 can cam over the ramp 466 of the alignment member 365and snap over the shoulder 377 of the alignment member 365 until thealignment member 365 is disposed in the forward aperture 448 (e.g., seeFIG. 18). In certain examples, the forward aperture 448 is sized toenable axial movement of the keying member 360 relative to the proximalhousing 340 (see FIG. 18). For example, the forward aperture 448 can besized to accommodate rearward movement of the ferrule 310 sufficient tocompress the spring 335. The engagement between the alignment member 365and the aperture 448 inhibits rotation of the keying member 360 relativeto the proximal housing 440. Accordingly, the interaction between thealignment member 365 and the forward aperture 448 maintain a tuningposition of the fiber optic arrangement 300 relative to the connector430.

In some implementations, the proximal housing 440 defines a rearwardaperture 449 sized to receive a tab 475 of a cable anchor 470. The cableanchor 470 is attached to a jacket and/or strength layer 308 of thefiber 305 while allowing the fiber 305 to pass therethrough. As shown inFIG. 16, the cable anchor 470 includes a body 471 defining a passage472. The jacket and/or strength layer 308 enters the passage 472 untilreaching a stop surface 473. In certain implementations, the jacketand/or strength layer 308 can be epoxied within the passage 472. In someexamples, the jacket reaches the stop surface 473 and the strength layerreaches a second stop surface 474. In other examples, epoxy is onlyprovided within the passage 472 until the first stop surface 473.

A tab 475 extends outwardly from an exterior of the anchor body 471. Thetab 475 defines a rearwardly-facing ramped surface 475 a and aforwardly-facing shoulder 476. As shown in FIG. 18, the tab 475 fitswithin the rearward aperture 449 of the proximal housing 440 to inhibitrotation of the cable anchor 470 relative to the proximal housing 440.Also as shown in FIG. 18, the cable anchor 470 abuts against an innerstop surface of the proximal housing 440. The interaction between thecable anchor 470 and the inner stop surface inhibits rearward axialmovement of the jacket and/or strength layer 308 of the fiber 305relative to the proximal housing 440.

As shown in FIG. 18, the proximal housing 440 is sufficiently long toprovide a buckling/bowing region B for the optical fiber 305. Thebucking/bowing region B is a region in which the optical fiber 305 canlaterally flex to accommodate rearward movement of the ferrule 310relative to the distal housing 450 and proximal housing 440. In certainimplementations, the distal housing 450 also is sufficiently long toaccommodate the proximal housing 440. In certain examples, thefrustro-conical portion 444 of the proximal housing 440 extendsrearwardly from the distal housing 450.

In some implementations, the distal housing 450 includes multiplehousing pieces movable relative to each other. In the example shown, thedistal housing 450 defines an SC plug housing including an inner body451 and an outer body 456. In the example shown in FIGS. 17 and 18, theinner body 451 is longer than the outer body 456. For example, the innerbody 451 is sufficiently long that a majority of the catch aperture 454is disposed outside of the outer body 456 when the distal housing 450 isassembled.

The inner body 451 defines the rear opening 452, an aperture 451 athrough which a tuning mark on the ferrule hub 315 is visible, and thecatch apertures 454. In certain implementations, a forward end of theinner housing 451 is inserted through a rear end of the outer housing456. In certain implementations, wings of the inner housing 451 latchinto apertures defined by the outer housing 456 (e.g., see FIG. 17). Inother implementations, the inner housing 451 otherwise axially androtationally secures to the outer housing 456. In other implementations,the distal housing 450 is integrally formed or formed from parts thatare axially and rotationally fixed relative to each other. Otherexamples of connectorizing the fiber optic arrangements 100, 300 areshown in U.S. Application No. 62/268,418, filed Dec. 16, 2015, titled“Field Installed Fiber Optic Connector,” the disclosure of which ishereby incorporated herein by reference in its entirety.

FIG. 20 illustrates another example protective arrangement 600 that canbe mounted around an example fiber optic arrangement 601. The fiberoptic arrangement 601 includes a ferrule 602 that terminates an opticalfiber 604. A ferrule hub 605 carries the ferrule 602. A keying member606 mounts over the hub 605. A spring 608 also mounts over the hub 605.In certain implementations, the ferrule hub 605 and the keying member606 are the same as the ferrule hub 1115 and the keying member 1120shown in FIGS. 30 and 31 below.

In certain implementations, the keying member 606 includes a first stopmember 607 spaced along an axial length of the keying member 606 from asecond stop member 607. In certain examples, each stop member 607 has ashoulder facing the shoulder of the other stop member 607. In certainexamples, each stop member 607 defines a ramped surface facing away fromthe other stop member 607. In certain examples, the keying member 606defines an axial slot 606 a (FIG. 24) that extends along the axiallength of the keying member 606. In the example shown, the axial slot606 a is located at an opposite circumferential side of the keyingmember 606 from the stop members 607.

The protective arrangement 600 can then be pulled or pushed through theduct. In certain implementations, the protective arrangement 600includes a first housing piece 610 a and a second housing piece 610 bthat cooperate to enclose the fiber optic arrangement 601. In certainimplementations, the forward end of the protective arrangement 600defines a tapered nose 611 to aid in navigation through ducts. Incertain implementations, the tapered nose 611 defines an aperture 612. Apulling string could be inserted through the aperture to attach thepulling string to the protective arrangement 600, thereby allowing theprotective arrangement 600 to be pulled through the duct.

Each housing piece 610 a, 610 b defines a cavity sized and shaped toaccommodate the components of the fiber optic arrangement 601. Forexample, the cavity may be sized and shaped to accommodate the ferrule602, dust cap 603, and ferrule hub 605 after termination of the opticalfiber 604. In certain examples, the cavity is sized and shaped toaccommodate a spring 608. In certain examples, the cavity is sized andshaped to accommodate a cable anchor.

In certain examples, the cavity is sized and shaped to accommodate akeying member 606. For example, at least one of the housing pieces 610a, 610 b defines a window 617 to accommodate the stop members 607. Inthe example shown, each housing piece 610 a, 610 b defines a window 617through which the stop members 607 can extend.

In certain implementations, the protective arrangement 600 is assembledabout the fiber optic arrangement 601 in the factory after terminationof the optical fiber 604 at the ferrule 602 and before shipping of thefiber optic arrangement 600 to an installation site.

In certain implementations, the housing pieces 610 a, 610 b definealignment keys that aid in mating the housing pieces 610 a, 610 b. Inthe example shown, the alignment keys include pegs and holes. In otherimplementations, other types of alignment keys can be used.

FIGS. 21-24 illustrate one example optical connector 630 or componentsthereof that can be formed using the fiber optic arrangement 601. FIG.21 illustrates the components of the optical connector 630 that areassembled about the fiber optic arrangement 601 in the field after thefiber optic arrangement 601 is pulled/pushed to the demarcation site.FIGS. 22-24 show the components installed around the fiber opticarrangement 601.

The field-installed components of the optical connector 630 include aproximal connector housing 640 and a distal connector housing 650. Incertain examples (e.g., an SC connector), a grip body 660 can be mountedover the distal connector housing 650. The proximal housing 640 can beinstalled over the fiber optic arrangement 601. The proximal housing 640engages the keying member 606 to rotationally retain the keying member606 (and hence the hub 605) relative to the proximal housing 640. Incertain implementations, the proximal housing 640 also axially limitsmovement of the hub 605 and ferrule 602 relative to the proximal housing640.

An example proximal housing 640 extends along a length between aproximal end 641 and a distal end 642. An axial slot 643 runs along thelength of the proximal housing 640. Accordingly, the proximal housing640 is mounted to the optical fiber 602 by sliding the optical fiber 602through the axial slot 643. In certain implementations, the proximalhousing 640 is resilient and the slot 643 is sized so that the opticalfiber 602 pushes edges of the proximal housing 640 outwardly to enlargethe slot 643 as the fiber 602 passes through the slot 643. Accordingly,the proximal housing 640 inhibits removal of the fiber 602 aftersnapping over the fiber 602.

The proximal housing 640 includes latch members 645 configured to holdthe proximal housing 640 to the distal housing 650. In certain examples,the latch members 645 are disposed towards the distal end 642. In theexample shown, the proximal housing 640 has two latch members 645 onopposite sides of the circumference of the proximal housing 640. Incertain examples, the latch members 645 each have a ramp surface and ashoulder. In the example shown, each latch member 645 has an arrow shapewith two ramp surfaces and two shoulders. In other examples, the latchmembers 645 can have any shape.

In certain implementations, the proximal housing 640 defines first andsecond slots 646 a, 646 b separated by an abutment member 647 (see FIG.21). The first and second slots 646 a, 646 b are axially aligned. Thefirst slot 646 a is fully bounded around a periphery. The second slot646 b has an open end at the distal end of the proximal housing 640. Incertain examples, the abutment member 647 includes a bar extendingbetween the first and second slots 646 a, 646 b. In the example shown,the second slot 646 b is open at the distal end 642 of the proximalhousing 640. In other examples, the second slot 646 b could be closed atthe distal end 642 of the proximal housing 640.

In certain implementations, the proximal housing 640 defines afrustro-conical tail 670 that accommodates lateral pulling and bendingof the optical fiber 602 as the fiber 602 exits the proximal housing640. In some implementations, the rear of the proximal housing 640 isconfigured to mitigate the need for a separate strain-relief boot at therear of the fiber optic connector 630. For example, the frustro-conicaltail 670 may obviate the need for a separate strain-relief boot.Accordingly, the example fiber optic connector 630 does not include aseparate strain-relief boot.

During assembly of the connector 630, the proximal housing 640 isinserted over the bare optical fiber 602 by passing the bare opticalfiber 602 through the axial slot 643. The proximal housing 640 definesan interior spring stop 644 (FIG. 23) against which the spring 608 canseat when the optical connector 630 is assembled. In certainimplementations, the spring stop 644 is located sufficiently rearwardalong the proximal housing 640 to provide a gap G (FIG. 24) between therear of the hub 605 and the spring stop 644. Accordingly, when theoptical connector 630 is coupled to another optical connector, the fiberoptic arrangement 601 can be axially moved rearwardly relative to theoptical connector 630 against the bias of the spring 608. For example,the fiber optic arrangement 601 can be moved rearwardly until the rearof the hub 605 contacts the spring stop 644.

The hub 605 of the fiber optic arrangement 601 is aligned with theproximal housing 640 so that the stop members 607 of the keying member606 align with the second slot 646 b of the proximal housing 640. Thehub 605 is backed into the distal end of the proximal housing 640 sothat the abutment member 647 cams over the ramped surface of theproximal stop member 607. When the proximal stop member 607 clears theabutment member 647, the proximal stop member 607 snaps into the slot646 a. Accordingly, the first and second slots 646 a, 646 b enablelimited axial movement of the keying member 606 relative to the proximalhousing 640.

The keying member 606 can move between a first position in which theshoulder of the proximal stop member 607 engages the abutment member 647and a second position in which the shoulder of the distal stop member607 engages the abutment member 647. The spring 608 biases the hub 605distally relative to the proximal member 640 so that the shoulder of theproximal stop member 607 engages the abutment member 647. When theconnector 630 is optically coupled to another connector, the ferrule 602and hub 605 may be pushed in the proximal direction against the bias ofthe spring 608, but not beyond the second position.

An example distal housing 650 extends from a proximal end 651 to adistal end 652. The distal housing 650 defines a distal interior portionand a proximal interior portion separated by a reduced diameter passage.The distal housing 650 also defines an interior keying region configuredto receive the first portion of the hub 605 of the fiber opticarrangement 601. In certain examples, the keying region of the distalhousing 650 defines a plurality of flat surfaces. In an example, thekeying region has a hex shape.

During assembly, the fiber optic arrangement 601 is inserted into theproximal end 651 of the distal housing 650 until the first portion ofthe hub 605 reaches the keying region. The ferrule 602 extends throughthe reduced diameter passage and into the distal interior portion. In anexample, a distal end of the ferrule 602 extends distally beyond thedistal end 652 of the distal housing 650. The reduced diameter passageinhibits distal axial movement of the hub 605 relative to the distalhousing 650. The engagement between the distal portion of the hub 605and the keying region of the distal housing 650 inhibits rotationalmovement of the hub 605 relative to the distal housing 650. In certainexamples, the shape of the keying region also limits the number ofrotational positions in which the hub 605 can be inserted into thedistal housing 650.

The proximal interior portion of the distal housing 650 is sized toaccommodate the keying member 606 carried by the hub 605. In certainimplementations, the proximal interior portion is shaped to accommodatethe keying member 606 in only one rotational orientation. For example,as shown in FIG. 14, the proximal interior portion may providesufficient room for the stop members 607 of the keying member 606 at oneside 659 a and not at the opposite side 659 b (e.g., see FIG. 24).Accordingly, the proximal interior portion further limits the number ofrotational positions in which the hub 605 can be inserted into thedistal housing 650. For example, the side 659 b of the distal housing650 may define a keying member sized and shaped to be received withinthe axial slot 643 of the proximal housing 640.

The distal housing 650 also defines apertures or slots 657 at which toreceive the latch members 645 of the proximal housing 640. Each apertureor slot 657 has a distal-facing shoulder 658. A reduced width slit leadsfrom the proximal end 651 of the distal housing 650 to each aperture orslot 657. The slit may taper outwardly at the proximal end 651 tofacilitate insertion of the latch member 645 into the slit.

During assembly of the optical connector 630 at the demarcationlocation, the proximal housing 640 is connected to the distal housing650. In certain implementations, the distal portion 642 of the proximalhousing 640 is sized to be inserted into the proximal interior portionof the distal housing 650. The tabs 645 of the proximal housing 640enter the slits of the distal housing 650 and pass into the apertures orslots 657 until the shoulders of the tabs 645 engage the distal-facingshoulders 658 of the apertures or slots 657. Engagement between theshoulders of the tabs 645 and the shoulders 658 of the distal housing650 inhibit proximal axial movement of the proximal housing 640 relativeto the distal housing 650.

The fiber optic arrangement 601 is sandwiched between the distal and s650, 640. In certain implementations, a grip member 660 can be installedover the distal housing 640. In some examples, the grip member 660 ismounted to the distal housing 650 prior to assembly of the distal and s650, 640. In other examples, the grip member 660 is mounted to thedistal housing 650 after assembly of the distal and s 650, 640.

FIGS. 25-29 illustrate another example optical connector 730 orcomponents thereof that can be formed using the fiber optic arrangement601. FIGS. 25-27 illustrate the components of the optical connector 730that are assembled about the fiber optic arrangement 601 in the fieldafter the fiber optic arrangement 601 is pulled/pushed to thedemarcation site. FIGS. 28 and 29 show the components installed aroundthe fiber optic arrangement 601.

The field-installed components of the optical connector 730 include aproximal connector housing 740 and a distal connector housing 750. Incertain examples (e.g., an SC connector), a grip body 760 can be mountedover the distal connector housing 750. The proximal housing 740 can beinstalled over the fiber optic arrangement 601. The proximal housing 740engages the keying member 606 to rotationally retain the keying member606 (and hence the hub 605) relative to the proximal housing 740. Incertain implementations, the proximal housing 740 also axially limitsmovement of the hub 605 and ferrule 602 relative to the proximal housing640.

An example proximal housing 740 extends along a length between aproximal end 741 and a distal end 742. An axial slot 743 runs along thelength of the proximal housing 740. Accordingly, the proximal housing740 is mounted to the optical fiber 602 by sliding the optical fiber 602through the axial slot 743. In certain implementations, the proximalhousing 740 is resilient and the slot 743 is sized so that the opticalfiber 602 pushes edges of the proximal housing 740 outwardly to enlargethe slot 743 as the fiber 602 passes through the slot 743. Accordingly,the proximal housing 740 inhibits removal of the fiber 602 aftersnapping over the fiber 602.

The proximal housing 740 includes latch members 745 configured to holdthe proximal housing 740 to the distal housing 750. In certain examples,the latch members 745 are disposed at the proximal end 741. In theexample shown, the proximal housing 740 has two latch members 745 onopposite sides of the circumference of the proximal housing 740. Incertain examples, the latch members 745 each have a ramp surface and ashoulder. In the example shown, each latch member 745 has an arrow shapewith two ramp surfaces and two shoulders. In other examples, the latchmembers 745 can have any shape.

In certain implementations, the proximal housing 740 defines first andsecond slots 746 a, 746 b separated by an abutment member 747 (see FIG.21). The first and second slots 746 a, 746 b are axially aligned. Thefirst slot 746 a is fully bounded around a periphery. The second slot746 b has an open end at the distal end of the proximal housing 740. Incertain examples, the abutment member 747 includes a bar extendingbetween the first and second slots 746 a, 746 b. In the example shown,the second slot 746 b is open at the distal end 742 of the proximalhousing 740. In other examples, the second slot 746 b could be closed atthe distal end 742 of the proximal housing 740.

In certain implementations, the proximal end 741 of the proximal housing740 does not extend rearwardly beyond the proximal end 751 of the distalhousing 750 when the optical connector 730 is assembled (see FIG. 28).In certain implementations, the proximal housing 740 is sized so thatthe proximal housing 740 is fully disposed within the distal housing 750when the optical connector 730 is assembled (see FIG. 29). In certainimplementations, the proximal housing 740 is about half the length ofthe distal housing 750.

During assembly of the connector 730, the proximal housing 740 isinserted over the bare optical fiber 602 by passing the bare opticalfiber 602 through the axial slot 743. The hub 605 of the fiber opticarrangement 601 is aligned with the proximal housing 740 so that thestop members 707 of the keying member 706 align with the second slot 746b of the proximal housing 740. The hub 605 is backed into the distal endof the proximal housing 740 so that the abutment member 747 cams overthe ramped surface of the proximal stop member 607. When the proximalstop member 607 clears the abutment member 747, the proximal stop member607 snaps into the slot 746 a. Accordingly, the first and second slots746 a, 746 b enable limited axial movement of the keying member 606relative to the proximal housing 740.

The proximal housing 740 defines an interior spring stop 744 (FIG. 29)against which the spring 608 can seat when the optical connector 730 isassembled. In certain examples, the spring stop 744 is recessed withinthe proximal housing 740 forwardly of the proximal end 741. In certainexamples, the spring stop 744 is recessed sufficiently forwardly of theproximal end 741 that the rear end of the hub 605 abuts the spring stop744 even when the hub 605 is biased forwardly by the spring 608.

Accordingly, when the optical connector 730 is coupled to anotheroptical connector, the fiber optic arrangement 601 cannot be axiallymoved rearwardly relative to the optical connector 730 against the biasof the spring 608. In other examples, the hub 605 is spaced forwardlyfrom the spring stop 744 sufficient to enable some rearward axialmovement of the hub 605 relative to the proximal housing 740. In somesuch examples, however, the hub 605 and spring stop 744 are disposed sothat the hub 605 axially travels less than the distance between theopposing stop members 607 of the keying member 606. In certain examples,the hub 605 travels no more than half the distance between the opposingstop members 607.

An example distal housing 750 extends from a proximal end 751 to adistal end 752. The distal housing 750 defines a distal interior portionand a proximal interior portion separated by a reduced diameter passage.The distal housing 750 also defines an interior keying region configuredto receive the first portion of the hub 605 of the fiber opticarrangement 601. In certain examples, the keying region of the distalhousing 750 defines a plurality of flat surfaces. In an example, thekeying region has a hex shape.

During assembly, the fiber optic arrangement 601 is inserted into theproximal end 751 of the distal housing 750 until the first portion ofthe hub 605 reaches the keying region. The ferrule 602 extends throughthe reduced diameter passage and into the distal interior portion. In anexample, a distal end of the ferrule 602 extends distally beyond thedistal end 752 of the distal housing 750. The reduced diameter passageinhibits distal axial movement of the hub 605 relative to the distalhousing 750. The engagement between the distal portion of the hub 605and the keying region of the distal housing 750 inhibits rotationalmovement of the hub 605 relative to the distal housing 750. In certainexamples, the shape of the keying region also limits the number ofrotational positions in which the hub 605 can be inserted into thedistal housing 750.

The proximal interior portion of the distal housing 750 is sized toaccommodate the keying member 606 carried by the hub 605. In certainimplementations, the proximal interior portion is shaped to accommodatethe keying member 606 in only one rotational orientation. For example,as shown in FIG. 29, the proximal interior portion may providesufficient room for the stop members 607 of the keying member 606 at oneside 759 a and not at the opposite side 759 b (e.g., see FIG. 24).Accordingly, the proximal interior portion further limits the number ofrotational positions in which the hub 605 can be inserted into thedistal housing 750. For example, the side 759 b of the distal housing750 may define a keying member sized and shaped to be received withinthe axial slot 743 of the proximal housing 740 (see FIG. 28).

The distal housing 750 also defines apertures or slots 757 at which toreceive the latch members 745 of the proximal housing 740. Each apertureor slot 757 has a distal-facing shoulder 758. A reduced width slit leadsfrom the proximal end 752 of the distal housing 750 to each aperture orslot 757. The slit may taper outwardly at the proximal end 751 tofacilitate insertion of the latch member 745 into the slit.

During assembly of the optical connector 730 at the demarcationlocation, the proximal housing 740 is connected to the distal housing750. In certain implementations, the distal portion 742 of the proximalhousing 740 is sized to be inserted into the proximal interior portionof the distal housing 750. The tabs 745 of the proximal housing 740enter the slits of the distal housing 750 and pass into the apertures orslots 757 until the shoulders of the tabs 745 engage the distal-facingshoulders 758 of the apertures or slots 757. Engagement between theshoulders of the tabs 745 and the shoulders 758 of the distal housing750 inhibit proximal axial movement of the proximal housing 740 relativeto the distal housing 750.

The fiber optic arrangement 601 is sandwiched between the distal and s750, 740. In certain implementations, a grip member 760 can be installedover the distal housing 740. In some examples, the grip member 760 ismounted to the distal housing 750 prior to assembly of the distal and s750, 740. In other examples, the grip member 760 is mounted to thedistal housing 750 after assembly of the distal and s 750, 740.

In certain implementations, the fiber optic arrangement 100, 300, 601have optical fibers 105, 305, 604 having diameters of no more than 3 mm.In certain examples, the optical fibers 105, 305, 604 have diameters ofno more than 2 mm. In certain examples, the optical fibers 105, 305, 604have diameters of no more than 1.5 mm. In certain examples, the opticalfibers 105, 305, 604 have diameters of no more than 1.3 mm. In certainexamples, the optical fibers 105, 305, 604 have diameters of about 1.2mm.

In other implementations, an optical connector can be assembled aroundlarger fiber optic arrangements. For example, FIGS. 30-43 illustrateexample fiber optic arrangements having diameters of larger than 1.5 mmand connector components installable around the larger fiber opticarrangements. In certain examples, the larger fiber optic arrangementshave diameters of 2-5 mm. In certain examples, the larger fiber opticarrangements have diameters of 3 mm. In certain examples, the largerfiber optic arrangements have diameters of 4 mm. In certain examples,the larger fiber optic arrangements have diameters of 1.5 mm.

FIGS. 30 and 31 illustrate an example fiber optic arrangement 1100including a terminated end of an optical cable 1108. A ferrule 1110holds the distal end of the optical fiber 1105. A ferrule hub 1115carries the ferrule 1110. A keying member 1120 and a spring 1119 can bedisposed at the ferrule hub 1115. An anchor member 1130 can be mountedto the cable 1108 to form a demarcation point at which pulling on oneside of the optical fiber will not affect the other side.

To install the fiber optic arrangement 1100, the fiber optic arrangement1100 is pulled through a hole, duct, or other path to a connectiondestination. A connector body is assembled around the fiber opticarrangement 1100 at the connector destination. In an example, the firstend 1101 of the fiber optic arrangement 1100 is connectorized with an SCconnector. In other implementations, however, the first end 1101 of thefiber optic arrangement 1100 can be connectorized with an LC connector,an ST connector, an FC connector, an LX.5 connector, or any otherdesired connector. The assembled connector body is plugged into a portat the connection destination.

In certain implementations, the hole, duct, or other path through whichthe fiber optic arrangement 1100 is pulled has a maximum internaldiameter of no more than 4 mm. In certain implementations, the hole,duct, or other path through which the fiber optic arrangement 1100 ispulled has a maximum internal diameter of no more than 4.1 mm. Incertain implementations, the hole, duct, or other path through which thefiber optic arrangement 1100 is pulled has a maximum internal diameterof no more than 4.2 mm. In certain implementations, the hole, duct, orother path through which the fiber optic arrangement 1100 is pulled hasa maximum internal diameter of no more than 3.9 mm. In certainimplementations, the hole, duct, or other path through which the fiberoptic arrangement 1100 is pulled has a maximum internal diameter of nomore than 3.8 mm. In certain implementations, the hole, duct, or otherpath through which the fiber optic arrangement 1100 is pulled has amaximum internal diameter of no more than 3.7 mm. In certainimplementations, the hole, duct, or other path through which the fiberoptic arrangement 1100 is pulled has a maximum internal diameter of nomore than 4.3 mm. In certain implementations, the hole, duct, or otherpath through which the fiber optic arrangement 1100 is pulled has amaximum internal diameter of no more than 4.4 mm. In certainimplementations, the hole, duct, or other path through which the fiberoptic arrangement 1100 is pulled has a maximum internal diameter of nomore than 4.5 mm.

In some implementations, the fiber optic arrangement 1100 has a largestouter diameter of no more than 4 mm. In some implementations, theferrule hub 1115 defines the largest outer diameter of any part of thefiber optic arrangement 1100. In other implementations, the anchormember 1130 defines the largest outer diameter of any part of the fiberoptic arrangement 1100. In certain implementations, the fiber opticarrangement 1100 has a largest outer diameter of no more than 3.8 mm. Incertain implementations, the fiber optic arrangement 1100 has a largestouter diameter of no more than 3.7 mm. In certain implementations, thefiber optic arrangement 1100 has a largest outer diameter of no morethan 3.6 mm. In certain implementations, the fiber optic arrangement1100 has a largest outer diameter of no more than 3.5 mm.

To assemble the fiber optic arrangement 1100, a distal portion of ajacket 1107 is stripped from an optical fiber 1108 so that an opticalfiber 1105 extends distally from the terminated jacket 1107. In certainexamples, a layer of tensile strength members (e.g., aramid yarn) may bedisposed between the optical fiber 1105 and the jacket 1107. In suchexamples, the tensile strength layer is terminated and the optical fiber1105 extends a distance beyond the tensile strength layer.

An anchor member 1130 is disposed about the terminated end of the jacket1107. In certain implementations, ends of the tensile strength layerextend past the jacket 1107, wrap around over the jacket 1107, and arecovered by the anchor member 1130. In certain examples, epoxy or otheradhesive can be applied to secure the anchor member 1130 to the jacket1107 and/or to the tensile strength layer. In an example, the adhesivealso axially fixes the optical fiber 1105 relative to the anchor member1130. Accordingly, the anchor member 1130 may form a demarcation pointalong the cable 1108.

In certain examples, the anchor member 1130 includes an end face 1131through which the optical fiber 1105 extends and a peripheral wall 1132extending proximal of the end face 1131. A slot 1133 extends axiallyalong the peripheral wall 1132 to provide access to a passagewaytherethrough. The slot 1133 also extends through the end face 1131.Accordingly, the anchor member 1130 can be installed on the cable 1108by passing the optical fiber 1105 through the slot 1133 and then slidingthe anchor member 1130 backwards onto the terminated end of the jacket1107.

In certain implementations, the anchor member 1130 includes one or moretabs 1134 that each define a ramp surface 1135 and a shoulder 1136. Inthe example shown, each tab 1134 has a distal facing ramp 1135 and aproximal facing shoulder 1136. In certain examples, the anchor member1130 has two tabs spaced 180° apart on the peripheral wall 1132. Incertain examples, the anchor member 1130 includes a tapered supportflange 1138 extending distally from the end face 1131 of the anchormember 1130. The optical fiber 1105 extends along and may be supportedby the support flange 1138.

The distal end of the fiber 1105 is polished and inserted into a ferrule1110. The fiber 1105 and/or the ferrule 1110 are tuned and cleaned. Adust cap 1111 covers an end face of the ferrule 1110 and an end face ofthe optical fiber 1105. In certain examples, the optical fiber tip andferrule 1110 are cleaned and the dust cap 1111 is disposed over thedistal of the ferrule 1110 to cover the fiber tip. In an example, thedust cap 1111 is friction fit to the ferrule 1110 in an axially fixedposition until a predetermine amount of axial force is applied to thedust cap 1111. In certain implementations, the fiber processingprocedure, from insertion of the fiber into the ferrule to mounting thedust cap, occurs in a factory. The dust cap 1111 maintains thecleanliness of the fiber tip during shipping and installation.

The dust cap 1111 includes a main body 1112 covering at least the distalof the ferrule 1110. A necked down portion 1113 of the main body 1112steps or tapers radially inwardly to define an annular groove. A distalportion 1114 of the main body 1112 steps or tapers radially outwardly todefine a pulling stop. In other implementations, the distal of the dustcap 1111 can define a hook or loop.

The ferrule 1110 is coupled to and/or carried by the hub 1115. As shownin FIG. 31, the hub 1115 has a first portion 1116, a second portion1117, and a third portion 1118. The first portion 1116 is the widestportion of the hub 1115. The first portion 1116 has at least onemultiple flat surface. In the example shown, the first portion 1116includes six flat surfaces. In certain examples, one of the flatsurfaces can be marked once the fiber 1105 and/or ferrule 1110 is tunedto indicate a core concentricity of the fiber 1105 and/or ferrule 1110.

The second portion 1117 is located between the first portion 1116 andthe third portion 1118. The second portion 1117 defines a key for matingwith a keying member 1120. In the example shown, the second portion 1117also defines at least one flat surface. In the example shown, the secondportion 1117 defines six flat surfaces. In certain examples,cross-dimensions of the second portion 1117 are smaller thancross-dimensions of the first portion 1116. In certain examples, anaxial length of the second portion 1117 is longer than an axial lengthof the first portion 1116.

The third portion 1118 is proximal of the second portion 1117. The thirdportion 1118 has a cross-dimension that is smaller than thecross-dimensions of the second portion 1117. In the example shown, thethird portion 1118 is tubular. In other examples, however, the thirdportion 1118 can have other shapes. A resilient member (e.g., a coilspring) 1119 mounts over the third portion 1118. In certain examples,the third portion 1118 of the hub 1115 is sufficiently long to supportthe spring 1119.

The keying member 1120 can be mounted over the second portion 1117 ofthe hub 1115. The keying member 1120 includes a body 1121 defining akeyway interior 1122 that mates with the key of the second portion 1117of the ferrule hub 1115. In the example shown, the keyway interior ofthe keying member 1120 defines a hex shape that matches the hex shape ofthe second portion 1117 of the hub 1115. Accordingly, the keying member1120 is rotationally fixed relative to the second portion 1117 whenmounted over the second portion 1117.

In certain implementations, the body 1121 defines a slot 1123 sized toenable the fiber 1105 to pass through the slot 1123 and into theinterior of the keying member 1120. Accordingly, the keying member 1120is mounted to the cable 1108 by sliding the keying member 1120 over thefiber 1105 and sliding the keying member distally over the third portion1118 of the hub 1115 and onto the second portion 1117. In certainexamples, the first portion 1116 of the hub 1115 has a sufficientcross-dimension to inhibit further distal axial passage of the keyingmember 1120 relative to the hub 1115.

The keying member 1120 also includes one or more stop members 1124extending radially outwardly from the body 1121. In the example shown,the keying member 1120 includes a distal stop member 1124 a and aproximal stop member 1124 b that are spaced apart along an axial lengthof the keying member 1120. In certain implementations, each stop member1124 has an outer ramp surface 1125 and an inwardly facing shoulder1126. The shoulders 1126 of the stop members 1124 a, 1124 b face eachother. In certain implementations, a recessed detent 1127 is disposedbetween the two stop members 1124.

The fiber optic arrangement 1100 can be coiled, boxed, or otherwisestored or packaged until installation is desired. In someimplementations, to install the fiber optic arrangement 1100 (e.g., at adwelling), a pulling lead can be secured to the dust cap 1111. Forexample, the pulling lead can be wrapped around and secured at thegroove defined at the necked down portion 1113 of the dust cap 1111.Pulling on the pulling lead causes the pulling lead to abut the pullingstop 1114, thereby pulling the fiber optic arrangement 1100.Accordingly, the pulling lead can be utilized to pull the fiber opticarrangement 1100 through a hole, duct, or other path.

Alternatively, a protective arrangement 1300 can be mounted around thefiber optic arrangement 1100. The protective arrangement 1300 can thenbe pulled or pushed through the duct. In certain implementations, theprotective arrangement includes a main body 1301 and a tapered distalend 1302 that defines an aperture 1303. A wire, string, or other pullingmember is attached to the protective arrangement 1300 through theaperture 1303 (e.g., looped or hooked through).

In certain implementations, the protective arrangement 1300 includes afirst housing piece 1310 and a second housing piece 1310 that cooperateto enclose the fiber optic arrangement 1100. In the example shown, thefirst and second housing pieces are identical. In certainimplementations, the first and second housing pieces 1310 include matingalignment members (e.g., pegs and holes) to aid in aligning the firstand second housing pieces 1310.

The protective arrangement 1300 is configured to hold the components ofthe fiber optic arrangement 1100 in axially fixed positions relative toeach other and relative to the protective arrangement 1300 duringinstallation. In certain implementations, the protective arrangement1300 also is configured to hold the fiber optic arrangement 1100 in arotationally fixed position relative to the protective arrangement 1300during installation.

FIGS. 33 and 34 illustrate an example housing piece 1310 defining aplatform 1311 sized and shaped to support part of the ferrule 1110 ofthe fiber optic arrangement 1100. A portion of the housing piece 1310distal of the platform 1311 defines a cavity sized to accommodate thedust cap 1111 over another part of the ferrule 1110. The opposite end ofthe housing piece 1310 defines a second platform 1318 configured tosupport part of the jacketed cable 1108. An outward taper 1319 distal ofthe second platform 1318 protects the cable 1108 when the cable 1108bends relative to the protective arrangement 1300. In certain examples,the first and second housing pieces 1310 clamp the ferrule 1110 andcable 1108 between the platforms 1311, 1318 when assembled together.

A portion of the housing piece 1310 proximal of the platform 1311defines a hub receiving pocket 1313. In certain examples, the pocket1313 can be shaped to mate with the first portion 1116 of the hub 1115.In the example shown, the pocket 1313 has three flat sides that matchwith three of the flats of the first portion 1116 of the hub 1115.Accordingly, the pocket 1313 may inhibit rotation of the hub 1115relative to the housing piece 1310. As shown in FIG. 33, a transitionbetween the pocket 1313 and the first platform 1311 may inhibit distalaxial movement of the first portion 1116 of the hub 1115 relative to thehousing piece 1310. As shown in FIG. 35, the second platform 1318 alsocan aid in retaining the anchor member 1130 against proximal axialmovement relative to the protective arrangement 1300.

Certain types of housing pieces 1310 also define slots 1314 foraccommodating the tabs 1124 of the keying member 1120 carried by thesecond portion 1117 of the hub 1115. The distal tab 1124 a fits at thedistal end of the slot 1134 and the proximal tab 1124 b fits at theproximal end of the slot 1134. The slot 1314 is sized to inhibit axialmovement of the tabs 1124 (and hence the keying member 1120) relative tothe slot 1134. Accordingly, interaction between the keying member 1120and the housing piece 1310 further inhibits axial movement of the fiberoptic arrangement 1100 relative to the protective arrangement 1300.

Certain types of housing pieces 1310 also define a spring pocket 1315 inwhich a portion of the spring 1119 is disposed. The spring pocket 1315engages at least a portion of the spring 1119 to inhibit axial movementof the spring 1119 relative to the housing piece 1310.

Certain types of protective arrangements 1300 are configured to axiallyretain the anchor member 1130 in a fixed position relative to the hub1115. In certain implementations, a protective arrangement 1300 may haveone or more windows 1307 at each of which a tab 1134 of the anchormember 1130 can be received (see FIG. 32). In some examples, eachhousing piece 1310 defines a window 1307. In other examples, eachhousing piece 1310 defines a portion 1317 of one or more windows 1307.

FIGS. 37-43 illustrate assembling a fiber optic connector 1190 over thefiber optic arrangement 1100 when the fiber optic arrangement 1100arrives at the connection destination. The protective arrangement 1300is removed from the fiber optic arrangement 1100. Components of thefiber optic connector 1190 are assembled around the fiber opticarrangement 1100. The components of the fiber optic connector 1190include a proximal connector housing 1140, distal connector housing1150, and a strain relief boot 1170. In certain examples (e.g., an SCconnector), a grip body 1160 can be mounted over the distal connectorhousing 1150.

The strain-relief boot 1170 extends from a distal end 1172 to a proximalend 1173. The distal portion 1171 of the strain-relief boot 1170 isconfigured to mount to the connector 1190 (e.g., to the proximalconnector body 1140). The proximal portion 1174 of the boot 1170 tapersto meet the periphery of the cable 1108. The proximal portion 1174 ismore flexible than the distal portion 1171. In certain examples, theproximal portion 1174 is slotted to enhance lateral flexibility.

As shown in FIG. 37, the strain-relief boot 1170 is prepared formounting over the cable 1108 by inserting a spreader 1175 into theproximal end 1173 of the strain-relief boot 1170. In the example shown,the spreader 1175 has a body 1176 defining an axial slot 1177 providingaccess to a through-passage through the body 1176. The slot 1177 allowsthe body 1176 to be radially collapsed sufficient to fit within theproximal end 1173 of the boot 1170. The proximal end 1178 of the body1176 tapers radially outwardly to define a trumpet shape. The fiberoptic arrangement 1100 can be inserted into the spreader 1175 throughthe trumpet 1178 and can be threaded through the boot 1170 until theboot 1170 is disposed over the cable 1108 proximal of the fiber opticarrangement 1100.

Next, the proximal housing 1140 can be installed over the fiber opticarrangement 1100. The proximal housing 1140 engages the anchor member1130 to axially and rotationally retain the anchor member 1130 relativeto the proximal housing 1140. The proximal housing 1140 also engages thekey member 1120 to rotationally retain the keying member 1120 (and hencethe hub 1115) relative to the proximal housing 1140. In certainimplementations, the proximal housing 1140 also axially limits movementof the hub 1115 and ferrule 1110 relative to the proximal housing 1140.

FIGS. 38-40 illustrate an example proximal housing 1140 suitable for usewith the fiber optic arrangement 1100. The proximal housing 1140 has aproximal body portion 1141 and a distal body portion 1142. Across-dimension of the distal body portion 1142 is less than across-dimension of the proximal body portion 1141. The transition regionbetween the proximal and distal body portions 1141, 1142 can be a taper,a radial step, or a contoured surface. An axial slot 1143 runs along thelength of the proximal housing 1140 including along both the proximalbody portion 1141 and the distal body portion 1142.

In certain implementations, the proximal housing 1140 has a radialflange 1144. In certain implementations, the radial flange 1144 isdisposed on the proximal body portion 1141. In certain examples, theradial flange 1144 is disposed on the proximal body portion 1141 offsetinwardly from the proximal end of the proximal housing 1140.

In certain implementations, the proximal housing 1140 includes latchmembers 1145 configured to hold the proximal housing 1140 to the distalhousing 1150. In certain examples, the latch members 1145 are disposedat the distal portion 1142. In the example shown, the proximal housing1140 has two latch members 1145 on opposite sides of the circumferenceof the distal portion 1142. In certain examples, the latch members 1145each have a ramp surface 1145 a and a shoulder 1145 b. In the exampleshown, each latch member 1145 has an arrow shape with two ramp surfaces1145 a and two shoulders 1145 b. In other examples, the latch members1145 can have any shape.

In certain implementations, the proximal housing 1140 defines first andsecond slots 1146 a, 1146 b separated by an abutment member 1147 (seeFIG. 40). The first and second slots 1146 a, 1146 b are axially aligned.The first slot 1146 a is fully bounded around a periphery. The secondslot 1146 b has an open end at the distal end of the proximal housing1140. In certain examples, the abutment member 1147 includes a barextending between the first and second slots 1146 a, 1146 b. In theexample shown, the second slot 1146 b is defined between two flangesextending distally from the distal portion 1142 of the proximal housing1140. In other examples, the second slot 1146 b can be defined by thedistal portion 1142 of the proximal housing 1140.

In certain implementations, the proximal housing 1140 defines one ormore axial slots 1148 having distally-facing shoulders 1149 at theproximal ends of the slots 1148. In certain examples, the axial slots1148 are disposed at opposite sides of the circumference of the proximalportion 1141 of the proximal housing 1140.

During assembly of the connector 1190, the proximal housing 1140 isinserted over the bare optical fiber 1105 by passing the bare opticalfiber 1105 through the axial slot 1143. The proximal housing 1140 ismoved proximally over the anchor member 1130 until the tabs 1134 of theanchor member 1130 abut the proximal end of the proximal housing 1140.The proximal end of the proximal housing 1140 begins to cam over theramped surfaces 1135 of the tabs 1134 until the tabs 1134 reach theaxial slots 1148. The tabs 1134 snap into the slots 1148 so that theshoulders 1136 of each tab 1134 engages a distal-facing shoulder 1149 ofeach slot 1148. Accordingly, the proximal housing 1140 limits proximalaxial movement of the anchor member 1130 relative to the proximalhousing 1140. In certain implementations, the proximal housing 1140 alsois configured to limit distal axial movement of the anchor member 1130relative to the proximal housing 1140.

The proximal housing 1140 also defines an interior spring stop 1119 a(FIG. 40) against which the spring 1119 can seat the connector 1190 isassembled.

The hub 1115 of the fiber optic arrangement 1100 is aligned with theproximal housing 1140 so that the stop members 1124 of the keying member1120 align with the second slot 1146 b of the proximal housing 1140. Thehub 1115 is backed into the distal end of the proximal housing 1140 sothat the abutment member 1147 cams over the ramped surface of theproximal stop member 1124 b. When the proximal stop member 1124 b clearsthe abutment member 1147, the proximal stop member 1124 b snaps into thesecond slot 1146 a. Accordingly, the first and second slots 1146 a, 1146b enable limited axial movement of the keying member 1120 relative tothe proximal housing 1140.

The keying member 1120 can move between a first position in which theshoulder of the proximal stop member 1124 b engages the abutment member1147 and a second position in which the shoulder of the distal stopmember 1124 engages the abutment member 1147. The spring 1119 biases thehub 1115 distally relative to the proximal member 1140 so that theshoulder of the proximal stop member 1124 b engages the abutment member1147. When the connector 1190 is optically coupled to another connector,the ferrule 1110 and hub 1115 may be pushed in the proximal directionagainst the bias of the spring 1119, but not beyond the second position.

FIGS. 38 and 41 illustrate an example distal housing 1150 extending froma distal end 1151 to a proximal end 1152. The distal housing 1150defines a distal interior portion 1153 and a proximal interior portion1154 separated by a reduced diameter passage 1155. The distal housing1150 also defines an interior keying region 1156 configured to receivethe first portion 1116 of the hub 1115 of the fiber optic arrangement1100. In certain examples, the keying region 1156 of the distal housing1150 defines a plurality of flat surfaces. In the example shown, thekeying region 1156 has a hex shape.

During assembly, the fiber optic arrangement 1100 is inserted into theproximal end 1152 of the distal housing 1150 until the first portion1116 of the hub 1115 reaches the keying region 1156. The ferrule 1110extends through the reduced diameter passage 1155 and into the distalinterior portion 1153. In an example, a distal end of the ferrule 1110extends distally beyond the distal end 1151 of the distal housing 1150.The reduced diameter passage 1155 inhibits distal axial movement of thehub 1115 relative to the distal housing 1150. The engagement between thedistal portion 1116 of the hub 1115 and the keying region 1156 of thedistal housing 1150 inhibits rotational movement of the hub 1115relative to the distal housing 1150. In certain examples, the shape ofthe keying region 1156 also limits the number of rotational positions inwhich the hub 1115 can be inserted into the distal housing 1150.

The proximal interior portion 1154 of the distal housing 1150 is sizedto accommodate the keying member 1120 carried by the hub 1115. Incertain implementations, the proximal interior portion 1154 is shaped toaccommodate the keying member 1120 in only one rotational orientation.For example, as shown in FIG. 41, the proximal interior portion 1154 mayprovide sufficient room for the stop members 1124 of the keying member1120 at one side and not at the opposite side (e.g., see FIG. 41).Accordingly, the proximal interior portion 1154 further limits thenumber of rotational positions in which the hub 1115 can be insertedinto the distal housing 1150.

The distal housing 1150 also defines slots 1157 at which to receive thelatch members 1145 of the proximal housing 1140. Each slot 1157 has adistal-facing shoulder 1158. A reduced width slit 1159 leads from theproximal end 1152 of the distal housing 1150 to each slot 1157. The slit1159 may taper outwardly at the proximal end 1152 to facilitateinsertion of the latch member 1145 into the slit 1159.

During assembly of the connector 1190, the proximal housing 1140 isconnected to the distal housing 1150. In certain implementations, thedistal portion 1142 of the proximal housing 1140 is sized to be insertedinto the proximal interior portion 1154 of the distal housing 1150. Thetabs 1145 of the proximal housing 1140 enter the slits 1159 of thedistal housing 1150 and pass into the slots 1157 until the shoulders1145 b of the tabs 1145 engage the distal-facing shoulders 1158 of theslots 1157. Engagement between the shoulders 1145 b and the shoulders1158 inhibit proximal axial movement of the proximal housing 1140relative to the distal housing 1150.

When the fiber optic arrangement 1100 is sandwiched between the distaland s 1150, 1140, the strain-relief boot 1170 can be mounted over theproximal housing 1140. In certain implementations, the spreader 1175 isstill holding open the proximal end 1173 of the boot 1170. The boot 1170is moved distally until the distal portion 1171 of the boot 1170 ismounted over a portion of the proximal body portion 1141 of the proximalhousing 1140. In certain implementations, the boot 1170 is moveddistally over the proximal body portion 1141 until the boot 1170 reachesthe radial flange 1144 of the proximal housing 1140. When the boot 1170is properly positioned relative to the proximal housing 1140, thespreader 1175 is removed from the proximal end 1173 of the boot 1170.The proximal portion 1174 resiliently returns to its default shape,which tapers down to the width of the cable 1108.

In certain implementations, a grip member 1160 can be installed over thedistal housing 1140. In some examples, the grip 1160 is mounted to thedistal housing 1140 prior to assembly of the distal and s 1150, 1140. Inother examples, the grip 1160 is mounted to the distal housing 1140after assembly of the distal and s 1150, 1140.

Having described the preferred aspects and implementations of thepresent disclosure, modifications and equivalents of the disclosedconcepts may readily occur to one skilled in the art. However, it isintended that such modifications and equivalents be included within thescope of the claims which are appended hereto.

1. (canceled)
 2. A connector arrangement comprising: a ferrule assemblyterminating an optical fiber of an optical cable, the ferrule assemblyincluding an optical ferrule and a hub supporting the ferrule, theoptical ferrule receiving the optical fiber so that an end of theoptical fiber is accessible at an end face of the optical ferrule; afront connector housing arrangement, the front connector housingarrangement including a first body defining an interior in which theferrule assembly is disposed so that the end face of the optical ferruleis accessible through an open front of the first body, the first bodyincluding a first portion of a keying arrangement at the interior, thefirst body also including a first portion of a latching arrangement; anda rear connector housing arrangement that couples to the front connectorhousing arrangement, the rear connector housing arrangement including: akeying member coupled to the hub of the ferrule assembly in arotationally fixed position, the keying member having an exterior thatincludes a second portion of the keying arrangement, the second portionof the keying arrangement being configured to engage the first portionof the keying arrangement in only one rotational orientation torotationally key the ferrule assembly to the first body; an anchormember disposed about the optical fiber, the anchor member beingattached to a jacket or strength layer of the optical cable; and asecond body coupling together the keying member and the anchor member,the second body including a second portion of the latching arrangementthat is configured to engage the first portion of the latchingarrangement of the first body to secure the keying member and the anchormember to the first body.
 3. The connector arrangement of claim 2,further comprising a coil spring disposed within the rear connectorhousing arrangement, the coil spring being configured to bias theferrule assembly towards the open front of the first body.
 4. Theconnector arrangement of claim 3, wherein the coil spring extends from aspring stop defined within an interior of the rear connector housingarrangement towards the hub of the ferrule assembly.
 5. The connectorarrangement of claim 4, wherein the spring stop is defined by the secondbody.
 6. The connector arrangement of claim 4, wherein the coil springhas a first end abutting the spring stop and an opposite second endabutting the keying member.
 7. The connector arrangement of claim 2,wherein the front connector housing arrangement also includes a griphousing that mounts about the first body.
 8. The connector arrangementof claim 2, further comprising a dust cap mounted over the end face ofthe optical ferrule, the dust cap being sized to fit through the firstbody so that the dust cap remains on the optical ferrule during andafter assembly of the connector arrangement.
 9. The connectorarrangement of claim 2, wherein the first portion of the latchingarrangement defines a catch surface and the second portion of thelatching arrangement includes a protrusion extending outwardly from anexterior of the second body.
 10. The connector arrangement of claim 9,wherein the first portion of the latching arrangement is deflectable.11. The connector arrangement of claim 2, wherein the hub defines aplurality of externally facing flat surfaces; and wherein the keyingmember defines a plurality of inwardly facing flat surfaces that alignwith and engage the externally flat surfaces of the hub to rotationallyalign and secure the keying member with the hub.
 12. The connectorarrangement of claim 2, wherein the second body defines a slot andwherein the anchor member defines a protrusion that fits within the slotto retain the anchor member at the second body.
 13. The connectorarrangement of claim 2, further comprising a strain relief boot that isaxially fixed relative to the second body.
 14. The connector arrangementof claim 2, wherein the rear connector housing arrangement extendsbetween opposite first and second ends, the first end of the rearconnector housing arrangement having a different cross-dimension thanthe second end of the rear connector housing arrangement.
 15. Theconnector arrangement of claim 2, wherein the keying member defines aprotrusion that fits within a keyway defined within the first body. 16.The connector arrangement of claim 2, wherein the second body extendsbetween opposite first and second axial ends, wherein the second bodycouples to the keying member towards the first axial end of the secondbody, and wherein the second body couples to the anchor member towardsthe second axial end of the second body.
 17. The connector arrangementof claim 16, wherein the second portion of the latching arrangement isdisposed closer to the first axial end than to the second axial end. 18.The connector arrangement of claim 2, wherein the rear connector housingarrangement is assembled prior to being coupled to the front connectorhousing arrangement.
 19. The connector arrangement of claim 18, whereinthe rear connector housing arrangement is configured to be inserted intothe front connector housing arrangement from a rear of the frontconnector housing arrangement.
 20. The connector arrangement of claim 2,wherein the keying member snap-fits to the second body.
 21. A connectorsub-assembly configured to be moved through a duct, the connectorsub-assembly comprising: a ferrule assembly terminating an optical fiberof an optical cable, the ferrule assembly including an optical ferrule,a hub supporting the ferrule, and a dust cap mounted about the ferrule,the optical ferrule receiving the optical fiber so that an end of theoptical fiber is accessible at an end face of the optical ferrule, thedust cap covering the end face of the optical ferrule; a keying memberdisposed about the optical fiber, the keying member being coupled to thehub of the ferrule assembly in a rotationally fixed position, the keyingmember including a portion of a keying arrangement at an exteriorsurface of the keying member; an anchor member disposed about theoptical fiber, the anchor member being attached to a jacket or strengthlayer of the optical cable; a body coupling to the keying member to holdthe keying member at a rotationally fixed location relative to the body,the body also coupling to the anchor member to hold the anchor member ata rotationally fixed location relative to the body, the keying memberand the anchor member being carried with the body so that the keyingmember and the anchor member move axially in unison with the body whenthe body is moved axially; and a coil spring disposed about the opticalfiber between the hub of the ferrule assembly and the anchor member, thecoil spring being disposed within the body to be carried with the body.